diff --git a/packages/shared/src/constants.ts b/packages/shared/src/constants.ts
index fa69eb0..e218a43 100644
--- a/packages/shared/src/constants.ts
+++ b/packages/shared/src/constants.ts
@@ -16,3 +16,5 @@ export type DifficultyLevel = (typeof DIFFICULTY_LEVELS)[number];
 
 export const LOBBY_STATUSES = ["waiting", "in_progress", "finished"] as const;
 export type LobbyStatus = (typeof LOBBY_STATUSES)[number];
+
+export const MAX_LOBBY_PLAYERS = 4;