Tile rectangles with squares such that no two square tiles have a side in common.

Fill the 8x8 board with the given set of sticks.

Fill the board with pentominoes. They may overlap but only once on each position.

Colour the given map with the four colours red, blue, yellow and green.

Find the hidden rectangles.

Find the hidden rectangles.

Create an identical covering on both boards, each having its own type of tile.

Create an identical covering on two boards, each having its own type of tile.

The system automatically tries to tile any given board with copies of the given decominos.

Rearrange the tiles such that the new tiling doesn't contain any 'compound squares'.