diff --git a/src/lib/game/game.ts b/src/lib/game/game.ts
index be79b9d..e6acbe4 100644
--- a/src/lib/game/game.ts
+++ b/src/lib/game/game.ts
@@ -1,3 +1,10 @@
+import { Awaitable } from "../utils.ts";
+
 export type Info = { kind: "abscent" } | { kind: "somewhere" } | { kind: "there" };
 
 export type GuessResult = { kind: "success" } | { kind: "failure"; informations: Info[] };
+
+export interface Gaming {
+	length(): number;
+	guess(guess: string, known: string): Awaitable<GuessResult>;
+}