Cistern

Fill the tanks and read the water. A cistern is split into connected tanks, and water in each tank settles level — filling from the bottom up. Raise or lower each tank so every row and column holds exactly its water count. A calm, tide-blue logic puzzle with hints when you're stuck.

• Logic
• Medium
• about 4 min

How to play

1. Tap any cell to raise or lower its tank's water to that row. Water always settles level, filling a tank from the bottom up.
2. The number beside each row and above each column is how many water cells it must contain.
3. Match every clue to solve the board — a clue turns green when it's right. Use the 💡 hint if you're stuck.

Play free in your browser — the first levels need no account.

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