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

How to play

There are five differences between the two drawings. Tap where you spot each one (or move the crosshair with the arrows and press Space). Three wrong taps and the game is over.

The story behind it

In Scandinavian tradition, the mara is a spirit that sits on the chest of sleepers, and is said to tangle horses’ manes. The game is made up. Read the story in The mara: the spirit that rides sleepers and gave its name to the nightmare.