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Shell Patterns

Binary rules · 30 levels

Eight little switches grow a seashell. Which ones?

How to play

1. Each new cell looks at the three cells above it (the row wraps around). The switch for that pattern says: pigment (dark) or plain.
2. Tap a switch card to flip it. Your shell regrows row by row; red marks show where it differs from the target. 🔒 switches are given.
3. Some targets are partly buried in sand, others only give a rule number: the 8 switches read as a binary number, 111 first.

Find a spot in the target where the three cells above are, say, ▪▫▪: the cell below tells you that switch.

Open Shell Patterns

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