Cog Bastion

Tower Defense

About Cog Bastion

Cog Bastion is a merge tower defence where merging costs you a gun. Two matching guards fuse into one stronger guard, and the socket they came from goes dark - but only the front row reaches the lane at low tiers, so every fusion asks whether the bigger machine will land somewhere it can actually shoot.

How to play

Tap an empty socket to build a guard. Drag one guard onto a matching one to fuse them into the next tier. Fusing frees a socket and buys reach, but spends a body, and wasted damage on small enemies is thrown away - so fusing everything is wrong. Hold a guard to see the lane it covers. Keyboard: Tab switches which guard line you build.

FAQ

How do you play Cog Bastion?

Cog Bastion is a merge tower defence where merging costs you a gun. The How to play section further down this page covers the full controls, step by step.

Is Cog Bastion free to play?

Yes — Cog Bastion is a free Tower Defense game on DFun. There is no download, no install and no sign-up: open the page and it runs straight in your browser.

Does Cog Bastion work on mobile?

Yes. Cog Bastion is an HTML5 Tower Defense game that runs in any modern browser, on mobile phones and on desktop computers — no app required.