Free printable Tridoku
Five triangular sudoku puzzles, from easy to expert, with solutions.
Tridoku is sudoku on a triangle. The board has 81 cells, the same number as a 9 × 9 sudoku, but the cells are triangles and there are no rows or columns. The numbers 1 to 9 go into nine large triangles and along the shaded legs of the outer and inner triangles.
This pack has five puzzles printed large, one or two to a page, and each puzzle uses a different color scheme. The first two puzzles are easy and the last one is expert level.
The pages are US Letter size. On A4 paper, choose "Fit to page" in the print window.
More Tridoku in the books
Tridoku: Volume 1
The Tridoku books come in three volumes, each with its own color theme. Every volume begins with the rules and the solving strategies, the puzzles run from easy to expert, and a free online solver can show you the next step when you are stuck.
How to play Tridoku
- Fill every empty cell with a number from 1 to 9.
- Each of the nine large triangles, marked with bold lines, must contain 1 to 9 once each.
- Each outer leg, the shaded cells along one edge of the puzzle, must contain 1 to 9 once each.
- Each inner leg, the shaded cells along one side of the upside-down triangle in the middle, must contain 1 to 9 once each.
- Neighboring cells cannot hold the same number, even when they touch only at a point.
In this pack
| Puzzles | 5 |
|---|---|
| Levels | 2 easy, 1 medium, 1 hard and 1 expert |
| Pages | 4, with the solutions on the last page |
| Paper | US Letter, 8.5 × 11 in |
| Cost | Free. No sign-up is needed. |
