diff --git a/apps/server/src/domains/game/application/ports/gameUseCasePorts.ts b/apps/server/src/domains/game/application/ports/gameUseCasePorts.ts
new file mode 100644
index 0000000..56ae47e
--- /dev/null
+++ b/apps/server/src/domains/game/application/ports/gameUseCasePorts.ts
@@ -0,0 +1,25 @@
+import type { TickData } from "../../GameLoop";
+
+export interface StartGamePort {
+  addPlayer(id: string): void;
+  startGameLoop(
+    roomId: string,
+    playerIds: string[],
+    onTick: (data: TickData) => void,
+    onGameEnd: () => void
+  ): void;
+  getRoomStartTime(roomId: string): number | undefined;
+}
+
+export interface ReadyForGamePort {
+  getAllPlayers(): unknown[];
+  getRoomStartTime(roomId: string): number | undefined;
+}
+
+export interface MovePlayerPort {
+  movePlayer(id: string, x: number, y: number): void;
+}
+
+export interface DisconnectPlayerPort {
+  removePlayer(id: string): void;
+}
diff --git a/apps/server/src/domains/game/application/useCases/executeDisconnectUseCase.ts b/apps/server/src/domains/game/application/useCases/executeDisconnectUseCase.ts
index 20f5f30..cad9dfe 100644
--- a/apps/server/src/domains/game/application/useCases/executeDisconnectUseCase.ts
+++ b/apps/server/src/domains/game/application/useCases/executeDisconnectUseCase.ts
@@ -1,10 +1,10 @@
 import { protocol } from "@repo/shared";
-import { GameManager } from "@server/domains/game/GameManager";
+import type { DisconnectPlayerPort } from "../ports/gameUseCasePorts";
 
 type EmitToAll = (event: string, payload?: unknown) => void;
 
 type ExecuteDisconnectUseCaseParams = {
-  gameManager: GameManager;
+  gameManager: DisconnectPlayerPort;
   playerId: string;
   emitToAll: EmitToAll;
 };
diff --git a/apps/server/src/domains/game/application/useCases/executeMovePlayerUseCase.ts b/apps/server/src/domains/game/application/useCases/executeMovePlayerUseCase.ts
index cb957a3..3034194 100644
--- a/apps/server/src/domains/game/application/useCases/executeMovePlayerUseCase.ts
+++ b/apps/server/src/domains/game/application/useCases/executeMovePlayerUseCase.ts
@@ -1,8 +1,8 @@
-import { GameManager } from "@server/domains/game/GameManager";
 import type { playerTypes } from "@repo/shared";
+import type { MovePlayerPort } from "../ports/gameUseCasePorts";
 
 type ExecuteMovePlayerUseCaseParams = {
-  gameManager: GameManager;
+  gameManager: MovePlayerPort;
   playerId: string;
   move: playerTypes.MovePayload;
 };
diff --git a/apps/server/src/domains/game/application/useCases/executeReadyForGameUseCase.ts b/apps/server/src/domains/game/application/useCases/executeReadyForGameUseCase.ts
index d1cb6ad..75aec11 100644
--- a/apps/server/src/domains/game/application/useCases/executeReadyForGameUseCase.ts
+++ b/apps/server/src/domains/game/application/useCases/executeReadyForGameUseCase.ts
@@ -1,12 +1,12 @@
 import { protocol } from "@repo/shared";
-import { GameManager } from "@server/domains/game/GameManager";
+import type { ReadyForGamePort } from "../ports/gameUseCasePorts";
 
 type EmitToSocket = (event: string, payload?: unknown) => void;
 
 type ExecuteReadyForGameUseCaseParams = {
   socketId: string;
   roomId?: string;
-  gameManager: GameManager;
+  gameManager: ReadyForGamePort;
   emitToSocket: EmitToSocket;
 };
 
diff --git a/apps/server/src/domains/game/application/useCases/executeStartGameUseCase.ts b/apps/server/src/domains/game/application/useCases/executeStartGameUseCase.ts
index 760cb58..2c9a8e3 100644
--- a/apps/server/src/domains/game/application/useCases/executeStartGameUseCase.ts
+++ b/apps/server/src/domains/game/application/useCases/executeStartGameUseCase.ts
@@ -1,12 +1,12 @@
 import { protocol, roomConsts } from "@repo/shared";
-import { GameManager } from "@server/domains/game/GameManager";
 import { RoomManager } from "@server/domains/room/RoomManager";
+import type { StartGamePort } from "../ports/gameUseCasePorts";
 
 type EmitToRoom = (roomId: string, event: string, payload?: unknown) => void;
 
 type ExecuteStartGameUseCaseParams = {
   ownerId: string;
-  gameManager: GameManager;
+  gameManager: StartGamePort;
   roomManager: RoomManager;
   emitToRoom: EmitToRoom;
 };