It’s a tiny handheld with a 0.91 inch display, four buttons, and one game: a “falling-block puzzle game,” that’s basically Tetris. The little game system is available from Tindie for $20 .

That's the same formula behind Asterisk, a tiny handheld designed specifically for the "falling-block puzzle game (a Tetris clone) that comes pre-loaded on it. The gizmo is powered by an ATtiny85 ...