Your towers don't stop anything. Enemies walk straight over them. The only thing that turns them aside is a wall, so you build the maze yourself. Then the intrusions start fighting back. PHASE slides through your walls. HOPPER vaults over them. BREAKER eats them. You built the maze. Now defend it. #towerdefense

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The intrusions walk straight over your towers. Firepower alone won't stop them. The routes they take are yours to build.

Circuit Keep is maze tower defense with no fixed paths. Intrusions pour in from breach points and pathfind toward your CORE across an open grid. You wall that grid into the maze you want, line it with damage, and force every wave down a path you chose. There are no preset routes and no race against the clock. Pause whenever you want to think, and rebuild mid-wave when a better idea hits.

Walls are only half the puzzle. Everything that deals damage runs on power, so where you place your towers matters as much as where they shoot. The maze you carve and the power that feeds it have to be designed together.

WHAT'S IN THE DEMO

- 10 levels: the campaign's first 7, plus an optional 3-level tutorial built for first-timers
- 6 module families with branching upgrade paths. You start with 3 and unlock 3 more as you play
- 4 intrusion families, from basic runners to fast-swarming clusters and shrouded stalkers that resist whole damage types
- Full mazing and the open palette: every module you've unlocked, every wave
- Plays with mouse alone, with keyboard shortcuts if you want them
- Windows (See Steam demo for Mac, Linux, and Steamdeck support)

INTRUSIONS THAT FIGHT BACK

Across the full campaign, every intrusion family breaks your defenses a different way:

- SCRAMBLER broadcasts a field that drags down the fire rate of every module near it
- PARASITE ignores your CORE at first, draining your power to siphon your income
- PHASE turns intangible and slides straight through your walls
- BREAKER exists to eat walls, and takes them apart faster than anything else
- SWARMs hunt as a network: the instant one finds a clear path, the whole wave snaps onto it

THE FULL GAME, LAUNCHING 2026

The full game is a three-act campaign of 40+ levels that introduces matchups one family at a time, with NORMAL and HARD difficulties you can switch between anytime, each keeping its own progress and stars. Past the campaign sit a RESEARCH GRAPH of permanent upgrades and an ENDLESS mode that escalates until your defenses finally fall. All told: 12 module families against 12 intrusion families, 7 elites, and 3 bosses.

Wishlist Circuit Keep on Steam: https://store.steampowered.com/app/4731380/Circuit_Keep/

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