TEN ISLANDS. ONE RISING TIDE.

The FloodHarbor Guard

Every barrier buys a boundary.
Every move gives the water its turn.

Keep every ship afloat

Select an empty tile, then place a barrier. The blue water spreads one tile in all four directions after each placement. A ship touched by water is lost. Enclose the water or shield every ship, then let the tide run until it stops.

Your harbor controls

Click a tile or use arrow keys / WASD. Space places a barrier. F starts or pauses the tide. Z undoes a turn. R retries. Moving the cursor costs no turn. All ten charts are open to practice.