Brainblox

Brainblox is a daily placement puzzle played in the browser. On the left is an empty wooden box, six units by six; on the right is a gallery of eight blox in four colours and several sizes, from a six by one plank to small one by two pieces. You pick a blox, tap the box to place it, and double-tap to turn it.

The day's wall comes with three numbered rules, such as which blox lie flat and which stand upright, which sides of the red blox may touch anything, and which pieces must touch each other. One rule applies every day: no two blox of the same colour may touch, not even at a corner. When the box is full you check it against the rules. If you are stuck you can reveal one or two blox of the solution, and each reveal costs one of your three lives.

Each wall has a game number and is the same for every player that day. The game is made by Geoff Kershaw, whose itch.io page credits the Krypton Factor team; the daily wall went live in August 2026. The home page also offers a timed version of the same wall, where after three minutes a piece of the answer is revealed every three minutes and your stars drop, a daily code-breaking game called Blox in the Box, a practice mode, a streak counter and a group score table.