TriangleBlocks (PuzzleMadness)

In TriangleBlocks the board is an irregular shape cut from a grid of triangles, usually with a few triangular holes, and the pieces are small shapes built from two to six triangles: diamonds, strips, chevrons and hearts. You fit every piece into the board. When you are done there must be no overlaps and no triangle left uncovered.

Triangles add a twist that square tiling does not have, because each cell points up or down and a piece only fits where its triangles line up with the grid's. On 28 October 2026 the Medium board was ten triangles wide with twelve pieces to place around two holes.

PuzzleMadness is a free puzzle website run by Dewi, a software developer who started out making games for the PlayStation 2, Nintendo Wii and DS and now builds the site as a hobby. It carries dozens of puzzle types, from classic sudoku to newer logic grids, and each one gets its own dated puzzle every day at each difficulty. TriangleBlocks comes in Easy, Medium and Hard versions. The Mixed page is not a copy of one of them: it serves a fourth grid of its own each day. Every one of the four is shared by everyone who opens it that day.

The site checks your grid as you go and tells you when it is finished; it does not publish solutions. Each completed puzzle earns a score, and scores feed a monthly and an all-time TriangleBlocks leaderboard, where only your best attempt at a puzzle counts. Older days stay in the archive, so a missed puzzle can still be played later and still counts toward the current month. Playing needs no account; a free registration gives you a username on the leaderboards and a cloud save. The pages carry adverts.