ゲーム

How it works

The verb here is the volitional form しよう (let's do), built from する (do) — it's how you say "let's…" casually. The noun ゲーム (game) sits bare in front of it, no particle needed in speech. The tacked-on よ (come on) nudges the invitation at the listener, turning it into a friendly "hey, let's play a game!"