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Hilbert

Recursion · 30 levels

Turn nested blocks till one curve fills the grid.

How to play

1. The grid hides a Hilbert curve: one line through every cell, from IN to OUT. Some blocks have been turned.
2. Pick a block size, then tap a block to turn it a quarter clockwise. Big blocks turn everything inside them.
3. The curve lights up from IN as far as it connects. Light every cell within the tap limit (the proven fewest taps).

The Hilbert curve is made of four smaller Hilbert curves, each a turned copy. If a whole quarter looks right but faces the wrong way, turn the big block, not its pieces.

Open Hilbert

Teeter, Tint and Echo Heist are free starters. Other games unlock through earned game choices or permanent packs. Your progress stays in the browser; optional sign-in saves it to your website account.