Build higher than the sea can rise.
Pick a dry square to build on.
How to play
Build the tallest column you can before the sea swallows the city. Your score is its height in storeys.
Each turn you place one block. A block needs support: a neighbouring square at least as tall as the one you're building on. So a tower needs a plateau under it.
The special blocks each get you higher a different way — extra blocks per turn, looser support, ground reclaimed, time bought. You only get a few of each. Keys 1–6 switch blocks.
The tide rises on a schedule that keeps speeding up. Flooded squares can't be built on, and a flooded crane stops working.