Tap the game to open it fullscreen. On a computer, Esc exits; on a phone, use the ✕ button.

How to play

Start at the top-left corner. Each turn pick a colour: your territory turns that colour and swallows neighbouring squares of the same colour. Cover the board before the moves run out.

The story behind it

Cnut ruled England, Denmark and Norway. The tide legend is well known, but the puzzle is made up for the game. Read the story in Cnut the Great and the North Sea Empire: the king who ruled England, Denmark and Norway.