Stack modular tower pieces to create strange and unstable defences. Every run produces a different tower, each with its own strengths and weaknesses. Sometimes, designs that shouldn't work... somehow do.

The enemy won't let up, throwing wave after wave at you. The tower will fall, but as it crumbles you'll be able to unlock dozens of new materials, weapons, resource upgrades and perks for your next attempt.

Just when you think you've found the perfect strategy, new enemies and fearsome bosses force you back to the drawing board. The bigger your toolbox grows, the more strategic your engineering needs to become.

New biomes mean new terrain, new enemies, and plenty of new ways for your carefully engineered tower to come crashing down.

But remember, there is no perfect tower, because they all must fall!