Block 21

Block 21 is a color-matching puzzle where the goal is deceptively straightforward — select groups of three or more same-colored blocks to clear them from the board and work your way toward the magic number: 21.

Clearing larger clusters rewards more points, so there's a quiet satisfaction in spotting a big chain before tapping it. The challenge builds gradually as the board fills and fewer obvious moves remain.

It's the kind of game that fits a few spare minutes perfectly, though reaching 21 takes more thought than it first appears.