Single Stroke Samurai

Use any key at all!

Any key to start. Wait til you see the exclamation mark show: when it's there, let the Oni have it by pressing a button!

After the match concludes, either you'll win or you'll lose. When that happens and it returns to the "Wait" screen, just press a button again to start the countdown again.

Be careful: the Oni will gradually get harder and harder to defeat!