The only other rule is that no two adjacent cells - including diagonal ones - can contain the same number. Grids can be of any size - initially there are puzzles of sizes 5x5, 6x6, 7x7 and 8x8. There are three levels of puzzles Suguru puzzles are quite different than Sudoku, so you'll want to read these rules carefully: You'll see that the grid is subdivided into containers or cages, each of which is 1 to 5 cells in size. You need to fill each container with unique digits, counting up from 1. So for example a 2-square container contains the numbers 1 and 2. A 5-square container contains the numbers from 1 to 5. Adjacent (touching) cells may never contain the same number, and this includes diagonally adjacent cells. That's it! The cells in each puzzle grid are divided into groups (or clusters/containers) and each group contains the numbers 1 to n, where n is the number of cells in the group. the more logic steps are required to solve the puzzle. A "Solve One Cell" option with a walkthrough is available if you get