diff --git a/src/client/Transport.ts b/src/client/Transport.ts
index cbef4bbba..7d85ae931 100644
--- a/src/client/Transport.ts
+++ b/src/client/Transport.ts
@@ -4,6 +4,7 @@ import {
   AllPlayers,
   Cell,
   GameType,
+  Gold,
   PlayerID,
   PlayerType,
   Tick,
@@ -94,15 +95,13 @@ export class SendEmojiIntentEvent implements GameEvent {
 
 export class SendDonateGoldIntentEvent implements GameEvent {
   constructor(
-    public readonly sender: PlayerView,
     public readonly recipient: PlayerView,
-    public readonly gold: number | null,
+    public readonly gold: Gold | null,
   ) {}
 }
 
 export class SendDonateTroopsIntentEvent implements GameEvent {
   constructor(
-    public readonly sender: PlayerView,
     public readonly recipient: PlayerView,
     public readonly troops: number | null,
   ) {}
@@ -110,7 +109,6 @@ export class SendDonateTroopsIntentEvent implements GameEvent {
 
 export class SendQuickChatEvent implements GameEvent {
   constructor(
-    public readonly sender: PlayerView,
     public readonly recipient: PlayerView,
     public readonly quickChatKey: string,
     public readonly variables: { [key: string]: string },
@@ -119,17 +117,13 @@ export class SendQuickChatEvent implements GameEvent {
 
 export class SendEmbargoIntentEvent implements GameEvent {
   constructor(
-    public readonly sender: PlayerView,
     public readonly target: PlayerView,
     public readonly action: "start" | "stop",
   ) {}
 }
 
 export class CancelAttackIntentEvent implements GameEvent {
-  constructor(
-    public readonly playerID: PlayerID,
-    public readonly attackID: string,
-  ) {}
+  constructor(public readonly attackID: string) {}
 }
 
 export class CancelBoatIntentEvent implements GameEvent {
diff --git a/src/client/Utils.ts b/src/client/Utils.ts
index a6c90191f..62fc2e80e 100644
--- a/src/client/Utils.ts
+++ b/src/client/Utils.ts
@@ -4,7 +4,8 @@ export function renderTroops(troops: number): string {
   return renderNumber(troops / 10);
 }
 
-export function renderNumber(num: number): string {
+export function renderNumber(num: number | bigint): string {
+  num = Number(num);
   num = Math.max(num, 0);
 
   if (num >= 10_000_000) {
diff --git a/src/client/graphics/layers/BuildMenu.ts b/src/client/graphics/layers/BuildMenu.ts
index f048c2271..70f28ea65 100644
--- a/src/client/graphics/layers/BuildMenu.ts
+++ b/src/client/graphics/layers/BuildMenu.ts
@@ -12,7 +12,7 @@ import samlauncherIcon from "../../../../resources/images/SamLauncherIconWhite.s
 import shieldIcon from "../../../../resources/images/ShieldIconWhite.svg";
 import { translateText } from "../../../client/Utils";
 import { EventBus } from "../../../core/EventBus";
-import { Cell, PlayerActions, UnitType } from "../../../core/game/Game";
+import { Cell, Gold, PlayerActions, UnitType } from "../../../core/game/Game";
 import { TileRef } from "../../../core/game/GameMap";
 import { GameView } from "../../../core/game/GameView";
 import { BuildUnitIntentEvent } from "../../Transport";
@@ -314,13 +314,13 @@ export class BuildMenu extends LitElement implements Layer {
     return unit[0].canBuild !== false;
   }
 
-  private cost(item: BuildItemDisplay): number {
+  private cost(item: BuildItemDisplay): Gold {
     for (const bu of this.playerActions?.buildableUnits ?? []) {
       if (bu.type === item.unitType) {
         return bu.cost;
       }
     }
-    return 0;
+    return 0n;
   }
 
   private count(item: BuildItemDisplay): string {
diff --git a/src/client/graphics/layers/ChatModal.ts b/src/client/graphics/layers/ChatModal.ts
index 40cb4e4a4..7bec6d3b4 100644
--- a/src/client/graphics/layers/ChatModal.ts
+++ b/src/client/graphics/layers/ChatModal.ts
@@ -236,7 +236,6 @@ export class ChatModal extends LitElement {
 
       this.eventBus.emit(
         new SendQuickChatEvent(
-          this.sender,
           this.recipient,
           this.selectedQuickChatKey,
           variables,
diff --git a/src/client/graphics/layers/ControlPanel.ts b/src/client/graphics/layers/ControlPanel.ts
index 19d2bd02c..c01ae4bc9 100644
--- a/src/client/graphics/layers/ControlPanel.ts
+++ b/src/client/graphics/layers/ControlPanel.ts
@@ -2,6 +2,7 @@ import { LitElement, html } from "lit";
 import { customElement, state } from "lit/decorators.js";
 import { translateText } from "../../../client/Utils";
 import { EventBus } from "../../../core/EventBus";
+import { Gold } from "../../../core/game/Game";
 import { GameView } from "../../../core/game/GameView";
 import { AttackRatioEvent } from "../../InputHandler";
 import { SendSetTargetTroopRatioEvent } from "../../Transport";
@@ -46,10 +47,10 @@ export class ControlPanel extends LitElement implements Layer {
   private _manpower: number = 0;
 
   @state()
-  private _gold: number;
+  private _gold: Gold;
 
   @state()
-  private _goldPerSecond: number;
+  private _goldPerSecond: Gold;
 
   private _lastPopulationIncreaseRate: number;
 
@@ -124,7 +125,7 @@ export class ControlPanel extends LitElement implements Layer {
     this._troops = player.troops();
     this._workers = player.workers();
     this.popRate = this.game.config().populationIncreaseRate(player) * 10;
-    this._goldPerSecond = this.game.config().goldAdditionRate(player) * 10;
+    this._goldPerSecond = this.game.config().goldAdditionRate(player) * 10n;
 
     this.currentTroopRatio = player.troops() / player.population();
     this.requestUpdate();
diff --git a/src/client/graphics/layers/EventsDisplay.ts b/src/client/graphics/layers/EventsDisplay.ts
index 0ccba3800..ef236985e 100644
--- a/src/client/graphics/layers/EventsDisplay.ts
+++ b/src/client/graphics/layers/EventsDisplay.ts
@@ -380,7 +380,7 @@ export class EventsDisplay extends LitElement implements Layer {
   emitCancelAttackIntent(id: string) {
     const myPlayer = this.game.myPlayer();
     if (!myPlayer) return;
-    this.eventBus.emit(new CancelAttackIntentEvent(myPlayer.id(), id));
+    this.eventBus.emit(new CancelAttackIntentEvent(id));
   }
 
   emitBoatCancelIntent(id: number) {
diff --git a/src/client/graphics/layers/PlayerPanel.ts b/src/client/graphics/layers/PlayerPanel.ts
index 4e82be5bb..859803e7c 100644
--- a/src/client/graphics/layers/PlayerPanel.ts
+++ b/src/client/graphics/layers/PlayerPanel.ts
@@ -90,7 +90,6 @@ export class PlayerPanel extends LitElement implements Layer {
     e.stopPropagation();
     this.eventBus.emit(
       new SendDonateTroopsIntentEvent(
-        myPlayer,
         other,
         myPlayer.troops() * this.uiState.attackRatio,
       ),
@@ -104,7 +103,7 @@ export class PlayerPanel extends LitElement implements Layer {
     other: PlayerView,
   ) {
     e.stopPropagation();
-    this.eventBus.emit(new SendDonateGoldIntentEvent(myPlayer, other, null));
+    this.eventBus.emit(new SendDonateGoldIntentEvent(other, null));
     this.hide();
   }
 
@@ -114,7 +113,7 @@ export class PlayerPanel extends LitElement implements Layer {
     other: PlayerView,
   ) {
     e.stopPropagation();
-    this.eventBus.emit(new SendEmbargoIntentEvent(myPlayer, other, "start"));
+    this.eventBus.emit(new SendEmbargoIntentEvent(other, "start"));
     this.hide();
   }
 
@@ -124,7 +123,7 @@ export class PlayerPanel extends LitElement implements Layer {
     other: PlayerView,
   ) {
     e.stopPropagation();
-    this.eventBus.emit(new SendEmbargoIntentEvent(myPlayer, other, "stop"));
+    this.eventBus.emit(new SendEmbargoIntentEvent(other, "stop"));
     this.hide();
   }
 
diff --git a/src/client/graphics/layers/TeamStats.ts b/src/client/graphics/layers/TeamStats.ts
index e62152f13..dcbbd10b0 100644
--- a/src/client/graphics/layers/TeamStats.ts
+++ b/src/client/graphics/layers/TeamStats.ts
@@ -58,7 +58,7 @@ export class TeamStats extends LitElement implements Layer {
 
     this.teams = Object.entries(grouped)
       .map(([teamStr, teamPlayers]) => {
-        let totalGold = 0;
+        let totalGold = 0n;
         let totalTroops = 0;
         let totalScoreSort = 0;
 
diff --git a/src/client/graphics/layers/TopBar.ts b/src/client/graphics/layers/TopBar.ts
index 76e218ba5..991fda739 100644
--- a/src/client/graphics/layers/TopBar.ts
+++ b/src/client/graphics/layers/TopBar.ts
@@ -50,7 +50,7 @@ export class TopBar extends LitElement implements Layer {
 
     const popRate = this.game.config().populationIncreaseRate(myPlayer) * 10;
     const maxPop = this.game.config().maxPopulation(myPlayer);
-    const goldPerSecond = this.game.config().goldAdditionRate(myPlayer) * 10;
+    const goldPerSecond = this.game.config().goldAdditionRate(myPlayer) * 10n;
 
     return html`
       <div
diff --git a/src/core/Schemas.ts b/src/core/Schemas.ts
index c7030515d..f50ad78f8 100644
--- a/src/core/Schemas.ts
+++ b/src/core/Schemas.ts
@@ -240,7 +240,7 @@ export const EmbargoIntentSchema = BaseIntentSchema.extend({
 export const DonateGoldIntentSchema = BaseIntentSchema.extend({
   type: z.literal("donate_gold"),
   recipient: ID,
-  gold: z.number().nullable(),
+  gold: z.bigint().nullable(),
 });
 
 export const DonateTroopIntentSchema = BaseIntentSchema.extend({
diff --git a/src/core/configuration/Config.ts b/src/core/configuration/Config.ts
index 9ca741873..e6f4af76f 100644
--- a/src/core/configuration/Config.ts
+++ b/src/core/configuration/Config.ts
@@ -84,7 +84,7 @@ export interface Config {
 
   startManpower(playerInfo: PlayerInfo): number;
   populationIncreaseRate(player: Player | PlayerView): number;
-  goldAdditionRate(player: Player | PlayerView): number;
+  goldAdditionRate(player: Player | PlayerView): Gold;
   troopAdjustmentRate(player: Player): number;
   attackTilesPerTick(
     attckTroops: number,
diff --git a/src/core/configuration/DefaultConfig.ts b/src/core/configuration/DefaultConfig.ts
index fe51b043c..738e0987b 100644
--- a/src/core/configuration/DefaultConfig.ts
+++ b/src/core/configuration/DefaultConfig.ts
@@ -272,7 +272,7 @@ export class DefaultConfig implements Config {
     return this._gameConfig.infiniteTroops;
   }
   tradeShipGold(dist: number): Gold {
-    return 10000 + 150 * Math.pow(dist, 1.1);
+    return BigInt(Math.floor(10000 + 150 * Math.pow(dist, 1.1)));
   }
   tradeShipSpawnRate(numberOfPorts: number): number {
     return Math.min(50, Math.round(10 * Math.pow(numberOfPorts, 0.6)));
@@ -282,44 +282,49 @@ export class DefaultConfig implements Config {
     switch (type) {
       case UnitType.TransportShip:
         return {
-          cost: () => 0,
+          cost: () => 0n,
           territoryBound: false,
         };
       case UnitType.Warship:
         return {
           cost: (p: Player) =>
             p.type() === PlayerType.Human && this.infiniteGold()
-              ? 0
-              : Math.min(
-                  1_000_000,
-                  (p.unitsIncludingConstruction(UnitType.Warship).length + 1) *
-                    250_000,
+              ? 0n
+              : BigInt(
+                  Math.min(
+                    1_000_000,
+                    (p.unitsIncludingConstruction(UnitType.Warship).length +
+                      1) *
+                      250_000,
+                  ),
                 ),
           territoryBound: false,
           maxHealth: 1000,
         };
       case UnitType.Shell:
         return {
-          cost: () => 0,
+          cost: () => 0n,
           territoryBound: false,
           damage: 250,
         };
       case UnitType.SAMMissile:
         return {
-          cost: () => 0,
+          cost: () => 0n,
           territoryBound: false,
         };
       case UnitType.Port:
         return {
           cost: (p: Player) =>
             p.type() === PlayerType.Human && this.infiniteGold()
-              ? 0
-              : Math.min(
-                  1_000_000,
-                  Math.pow(
-                    2,
-                    p.unitsIncludingConstruction(UnitType.Port).length,
-                  ) * 125_000,
+              ? 0n
+              : BigInt(
+                  Math.min(
+                    1_000_000,
+                    Math.pow(
+                      2,
+                      p.unitsIncludingConstruction(UnitType.Port).length,
+                    ) * 125_000,
+                  ),
                 ),
           territoryBound: true,
           constructionDuration: this.instantBuild() ? 0 : 2 * 10,
@@ -327,41 +332,43 @@ export class DefaultConfig implements Config {
       case UnitType.AtomBomb:
         return {
           cost: (p: Player) =>
-            p.type() === PlayerType.Human && this.infiniteGold() ? 0 : 750_000,
+            p.type() === PlayerType.Human && this.infiniteGold()
+              ? 0n
+              : 750_000n,
           territoryBound: false,
         };
       case UnitType.HydrogenBomb:
         return {
           cost: (p: Player) =>
             p.type() === PlayerType.Human && this.infiniteGold()
-              ? 0
-              : 5_000_000,
+              ? 0n
+              : 5_000_000n,
           territoryBound: false,
         };
       case UnitType.MIRV:
         return {
           cost: (p: Player) =>
             p.type() === PlayerType.Human && this.infiniteGold()
-              ? 0
-              : 25_000_000,
+              ? 0n
+              : 25_000_000n,
           territoryBound: false,
         };
       case UnitType.MIRVWarhead:
         return {
-          cost: () => 0,
+          cost: () => 0n,
           territoryBound: false,
         };
       case UnitType.TradeShip:
         return {
-          cost: () => 0,
+          cost: () => 0n,
           territoryBound: false,
         };
       case UnitType.MissileSilo:
         return {
           cost: (p: Player) =>
             p.type() === PlayerType.Human && this.infiniteGold()
-              ? 0
-              : 1_000_000,
+              ? 0n
+              : 1_000_000n,
           territoryBound: true,
           constructionDuration: this.instantBuild() ? 0 : 10 * 10,
         };
@@ -369,12 +376,14 @@ export class DefaultConfig implements Config {
         return {
           cost: (p: Player) =>
             p.type() === PlayerType.Human && this.infiniteGold()
-              ? 0
-              : Math.min(
-                  250_000,
-                  (p.unitsIncludingConstruction(UnitType.DefensePost).length +
-                    1) *
-                    50_000,
+              ? 0n
+              : BigInt(
+                  Math.min(
+                    250_000,
+                    (p.unitsIncludingConstruction(UnitType.DefensePost).length +
+                      1) *
+                      50_000,
+                  ),
                 ),
           territoryBound: true,
           constructionDuration: this.instantBuild() ? 0 : 5 * 10,
@@ -383,12 +392,14 @@ export class DefaultConfig implements Config {
         return {
           cost: (p: Player) =>
             p.type() === PlayerType.Human && this.infiniteGold()
-              ? 0
-              : Math.min(
-                  3_000_000,
-                  (p.unitsIncludingConstruction(UnitType.SAMLauncher).length +
-                    1) *
-                    1_500_000,
+              ? 0n
+              : BigInt(
+                  Math.min(
+                    3_000_000,
+                    (p.unitsIncludingConstruction(UnitType.SAMLauncher).length +
+                      1) *
+                      1_500_000,
+                  ),
                 ),
           territoryBound: true,
           constructionDuration: this.instantBuild() ? 0 : 30 * 10,
@@ -397,20 +408,22 @@ export class DefaultConfig implements Config {
         return {
           cost: (p: Player) =>
             p.type() === PlayerType.Human && this.infiniteGold()
-              ? 0
-              : Math.min(
-                  1_000_000,
-                  Math.pow(
-                    2,
-                    p.unitsIncludingConstruction(UnitType.City).length,
-                  ) * 125_000,
+              ? 0n
+              : BigInt(
+                  Math.min(
+                    1_000_000,
+                    Math.pow(
+                      2,
+                      p.unitsIncludingConstruction(UnitType.City).length,
+                    ) * 125_000,
+                  ),
                 ),
           territoryBound: true,
           constructionDuration: this.instantBuild() ? 0 : 2 * 10,
         };
       case UnitType.Construction:
         return {
-          cost: () => 0,
+          cost: () => 0n,
           territoryBound: true,
         };
       default:
@@ -688,8 +701,8 @@ export class DefaultConfig implements Config {
     return Math.min(player.population() + toAdd, max) - player.population();
   }
 
-  goldAdditionRate(player: Player): number {
-    return 0.045 * player.workers() ** 0.7;
+  goldAdditionRate(player: Player): Gold {
+    return BigInt(Math.floor(0.045 * player.workers() ** 0.7));
   }
 
   troopAdjustmentRate(player: Player): number {
diff --git a/src/core/execution/ConstructionExecution.ts b/src/core/execution/ConstructionExecution.ts
index 49ed2e89f..ba7a7c9c0 100644
--- a/src/core/execution/ConstructionExecution.ts
+++ b/src/core/execution/ConstructionExecution.ts
@@ -2,6 +2,7 @@ import { consolex } from "../Consolex";
 import {
   Execution,
   Game,
+  Gold,
   Player,
   PlayerID,
   Tick,
@@ -26,7 +27,7 @@ export class ConstructionExecution implements Execution {
 
   private ticksUntilComplete: Tick;
 
-  private cost: number;
+  private cost: Gold;
 
   constructor(
     private ownerId: PlayerID,
diff --git a/src/core/execution/DonateGoldExecution.ts b/src/core/execution/DonateGoldExecution.ts
index 166f34cde..20837d66e 100644
--- a/src/core/execution/DonateGoldExecution.ts
+++ b/src/core/execution/DonateGoldExecution.ts
@@ -1,5 +1,5 @@
 import { consolex } from "../Consolex";
-import { Execution, Game, Player, PlayerID } from "../game/Game";
+import { Execution, Game, Gold, Player, PlayerID } from "../game/Game";
 
 export class DonateGoldExecution implements Execution {
   private sender: Player;
@@ -10,7 +10,7 @@ export class DonateGoldExecution implements Execution {
   constructor(
     private senderID: PlayerID,
     private recipientID: PlayerID,
-    private gold: number | null,
+    private gold: Gold | null,
   ) {}
 
   init(mg: Game, ticks: number): void {
@@ -28,14 +28,16 @@ export class DonateGoldExecution implements Execution {
     this.sender = mg.player(this.senderID);
     this.recipient = mg.player(this.recipientID);
     if (this.gold === null) {
-      this.gold = Math.round(this.sender.gold() / 3);
+      this.gold = this.sender.gold() / 3n;
     }
   }
 
   tick(ticks: number): void {
     if (this.gold === null) throw new Error("not initialized");
-    if (this.sender.canDonate(this.recipient)) {
-      this.sender.donateGold(this.recipient, this.gold);
+    if (
+      this.sender.canDonate(this.recipient) &&
+      this.sender.donateGold(this.recipient, this.gold)
+    ) {
       this.recipient.updateRelation(this.sender, 50);
     } else {
       consolex.warn(
diff --git a/src/core/execution/DonateTroopExecution.ts b/src/core/execution/DonateTroopExecution.ts
index 99dc4ca66..40fde1781 100644
--- a/src/core/execution/DonateTroopExecution.ts
+++ b/src/core/execution/DonateTroopExecution.ts
@@ -34,8 +34,10 @@ export class DonateTroopsExecution implements Execution {
 
   tick(ticks: number): void {
     if (this.troops === null) throw new Error("not initialized");
-    if (this.sender.canDonate(this.recipient)) {
-      this.sender.donateTroops(this.recipient, this.troops);
+    if (
+      this.sender.canDonate(this.recipient) &&
+      this.sender.donateTroops(this.recipient, this.troops)
+    ) {
       this.recipient.updateRelation(this.sender, 50);
     } else {
       consolex.warn(
diff --git a/src/core/execution/FakeHumanExecution.ts b/src/core/execution/FakeHumanExecution.ts
index 4fa3ec7cd..7a657c176 100644
--- a/src/core/execution/FakeHumanExecution.ts
+++ b/src/core/execution/FakeHumanExecution.ts
@@ -4,6 +4,7 @@ import {
   Difficulty,
   Execution,
   Game,
+  Gold,
   Nation,
   Player,
   PlayerID,
@@ -543,7 +544,7 @@ export class FakeHumanExecution implements Execution {
     return null;
   }
 
-  private cost(type: UnitType): number {
+  private cost(type: UnitType): Gold {
     if (this.player === null) throw new Error("not initialized");
     return this.mg.unitInfo(type).cost(this.player);
   }
diff --git a/src/core/game/Game.ts b/src/core/game/Game.ts
index f27821f50..d054a6b04 100644
--- a/src/core/game/Game.ts
+++ b/src/core/game/Game.ts
@@ -12,7 +12,7 @@ import { Stats } from "./Stats";
 
 export type PlayerID = string;
 export type Tick = number;
-export type Gold = number;
+export type Gold = bigint;
 
 export const AllPlayers = "AllPlayers" as const;
 
@@ -450,7 +450,7 @@ export interface Player {
   troops(): number;
   targetTroopRatio(): number;
   addGold(toAdd: Gold): void;
-  removeGold(toRemove: Gold): void;
+  removeGold(toRemove: Gold): Gold;
   addWorkers(toAdd: number): void;
   removeWorkers(toRemove: number): void;
   setTargetTroopRatio(target: number): void;
@@ -506,8 +506,8 @@ export interface Player {
 
   // Donation
   canDonate(recipient: Player): boolean;
-  donateTroops(recipient: Player, troops: number): void;
-  donateGold(recipient: Player, gold: number): void;
+  donateTroops(recipient: Player, troops: number): boolean;
+  donateGold(recipient: Player, gold: Gold): boolean;
 
   // Embargo
   hasEmbargoAgainst(other: Player): boolean;
@@ -619,7 +619,7 @@ export interface PlayerActions {
 export interface BuildableUnit {
   canBuild: TileRef | false;
   type: UnitType;
-  cost: number;
+  cost: Gold;
 }
 
 export interface PlayerProfile {
diff --git a/src/core/game/GameUpdates.ts b/src/core/game/GameUpdates.ts
index 385739d8a..b238365d0 100644
--- a/src/core/game/GameUpdates.ts
+++ b/src/core/game/GameUpdates.ts
@@ -2,6 +2,7 @@ import { AllPlayersStats, ClientID } from "../Schemas";
 import {
   EmojiMessage,
   GameUpdates,
+  Gold,
   MessageType,
   NameViewData,
   PlayerID,
@@ -103,7 +104,7 @@ export interface PlayerUpdate {
   playerType: PlayerType;
   isAlive: boolean;
   tilesOwned: number;
-  gold: number;
+  gold: Gold;
   population: number;
   workers: number;
   troops: number;
diff --git a/src/core/game/PlayerImpl.ts b/src/core/game/PlayerImpl.ts
index ccb35498d..8d8cbf949 100644
--- a/src/core/game/PlayerImpl.ts
+++ b/src/core/game/PlayerImpl.ts
@@ -137,7 +137,7 @@ export class PlayerImpl implements Player {
       playerType: this.type(),
       isAlive: this.isAlive(),
       tilesOwned: this.numTilesOwned(),
-      gold: Number(this._gold),
+      gold: this._gold,
       population: this.population(),
       workers: this.workers(),
       troops: this.troops(),
@@ -539,9 +539,13 @@ export class PlayerImpl implements Player {
     return true;
   }
 
-  donateTroops(recipient: Player, troops: number): void {
+  donateTroops(recipient: Player, troops: number): boolean {
+    if (troops <= 0) return false;
+    const removed = this.removeTroops(troops);
+    if (removed === 0) return false;
+    recipient.addTroops(removed);
+
     this.sentDonations.push(new Donation(recipient, this.mg.ticks()));
-    recipient.addTroops(this.removeTroops(troops));
     this.mg.displayMessage(
       `Sent ${renderTroops(troops)} troops to ${recipient.name()}`,
       MessageType.INFO,
@@ -552,10 +556,16 @@ export class PlayerImpl implements Player {
       MessageType.SUCCESS,
       recipient.id(),
     );
+    return true;
   }
-  donateGold(recipient: Player, gold: number): void {
+
+  donateGold(recipient: Player, gold: Gold): boolean {
+    if (gold <= 0n) return false;
+    const removed = this.removeGold(gold);
+    if (removed === 0n) return false;
+    recipient.addGold(removed);
+
     this.sentDonations.push(new Donation(recipient, this.mg.ticks()));
-    recipient.addGold(this.removeGold(gold));
     this.mg.displayMessage(
       `Sent ${renderNumber(gold)} gold to ${recipient.name()}`,
       MessageType.INFO,
@@ -566,6 +576,7 @@ export class PlayerImpl implements Player {
       MessageType.SUCCESS,
       recipient.id(),
     );
+    return true;
   }
 
   hasEmbargoAgainst(other: Player): boolean {
@@ -632,20 +643,20 @@ export class PlayerImpl implements Player {
   }
 
   gold(): Gold {
-    return Number(this._gold);
+    return this._gold;
   }
 
   addGold(toAdd: Gold): void {
-    this._gold += toInt(toAdd);
+    this._gold += toAdd;
   }
 
-  removeGold(toRemove: Gold): number {
-    if (toRemove <= 1) {
-      return 0;
+  removeGold(toRemove: Gold): Gold {
+    if (toRemove <= 0n) {
+      return 0n;
     }
-    const actualRemoved = minInt(this._gold, toInt(toRemove));
+    const actualRemoved = minInt(this._gold, toRemove);
     this._gold -= actualRemoved;
-    return Number(actualRemoved);
+    return actualRemoved;
   }
 
   population(): number {