One Block Short is a block puzzle you can play instantly — no install, no extra payment — where you place each block by hand to fill a line and clear it (the blocks never fall on their own).

Drag the right shape into the right gap, complete a row or column, and watch it disappear in one clean sweep. Get boxed in with no room left, and it's over — usually because you're, well, one block short.

Across 250 levels you'll chase combos, untangle tight corners, and get little quiz breaks mixed into play to keep your brain fresh between clears.