diff --git a/sharedUI/src/commonMain/kotlin/com/livrets/games/GamesServices.kt b/sharedUI/src/commonMain/kotlin/com/livrets/games/GamesServices.kt
new file mode 100644
index 0000000..4949036
--- /dev/null
+++ b/sharedUI/src/commonMain/kotlin/com/livrets/games/GamesServices.kt
@@ -0,0 +1,15 @@
+package com.livrets.games
+
+interface GamesServices {
+    suspend fun signIn(): Boolean
+    suspend fun isSignedIn(): Boolean
+    suspend fun submitScore(leaderboardId: String, score: Long): Boolean
+    suspend fun showLeaderboard(leaderboardId: String)
+}
+
+object NoopGamesServices : GamesServices {
+    override suspend fun signIn(): Boolean = false
+    override suspend fun isSignedIn(): Boolean = false
+    override suspend fun submitScore(leaderboardId: String, score: Long): Boolean = false
+    override suspend fun showLeaderboard(leaderboardId: String) {}
+}