Suguru

Also known as Tectonic. Rules below.

Grid Difficulty: Medium

How to play

The grid is split into bold-outlined regions.
A region of N cells must contain the numbers 1 to N, each exactly once.
Two touching cells — including diagonally — may never hold the same number.
There is no row or column rule, unlike Sudoku.

Click a cell and type a number, or use the pad. Press P to toggle pencil marks, arrow keys to move, ⌫ to erase.