Build elaborate structures from one simple rule in this addicting puzzle game.

The rule:

Place each number so that it is the sum of its neighbours.

Try it out!

Score: 0

Next Goal: 0

Hit Save to get a permanent plaintext record of your progress, which you can then copy and paste into this box later to reload.


The latest iteration of an old GameMaker game, which in turn was based on a pen-and-paper game I invented while bored in class. The strategy is surprisingly complex, and the addition of the Undo button makes it much less stressful and more rewarding when you get out of a tough spot. See how high you can get!

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