Screenshots
Watch trailer on Steam ↗Circuit Keep
Lambda 7 Tech LLC · Published by Lambda 7 Tech LLC · Official site ↗
Last updated 28 Sept 2026
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.
Indie, Strategy · 2026 · More free games
About this game
In Circuit Keep, your towers don't block anything.
A wave spawns. Enemies pathfind straight across the grid toward your CORE. They walk over every module you placed. The only thing that makes them change direction is a wall. So you build the maze, line it with firepower, and force every wave down a path you chose.
Then they start pushing back.
INTRUSIONS THAT FIGHT BACK
Each intrusion breaks your defenses a different way.
PHASE turns intangible mid-wave and slides straight through your walls. HOPPER vaults over walls and air gaps entirely.
SCRAMBLER drags down the fire rate of every module near it. PARASITE skips your CORE and drains your CHARGE NODES instead.
BREAKER exists to eat your walls. KERNEL, a boss, forks child intrusions to overwhelm you from multiple angles at once.
No two waves play the same way.
TOOLS TO FIGHT BACK
FOCUS FIRE: Mark any intrusion with a crosshair and every module in range locks onto it immediately.
OVERDRIVE: Permanently boost the damage of an entire module family.
OVERCLOCK: Speed up your economy, cooldowns, and modules for a short window when you need it most.
BUILD YOUR MAZE
Place FIREWALLS to reroute intrusions exactly where you want them. Your modules run on power, so placement matters as much as firepower. Every wall, every turn, every module position is a decision.
THREE ACTS. 40+ LEVELS. ENDLESS MODE.
A hand-crafted campaign introduces each module and intrusion one at a time across three acts. Struggling? Spend permanent upgrades on the RESEARCH GRAPH. Want more? Switch any level to HARD mode. Want to go as far as you can? Enter ENDLESS mode with everything unlocked.
WHAT IS IN THE BOX
12 module families with branching upgrade paths. Two paths per module, each with its own payoff: crit, knockback, extra targets, and more. Switch paths any time.
Four damage types: KINETIC, THERMAL, ELECTRIC, and CORRUPTIVE, each with status effects that stack and combine.
12 intrusion families, 7 elites, and 3 bosses.
No fixed loadouts. No RNG drafting. Every module you have unlocked is available every wave.
System Requirements
Will my PC run this? →Minimum
- Requires a 64-bit processor and operating system
- OS: Windows 10 (64-bit)
- Processor: Intel Core i3-4000 series / AMD equivalent (2 GHz dual-core)
- Memory: 4 GB RAM
- Graphics: Integrated graphics with WebGL 2.0 support (Intel HD 4000 or better)
- DirectX: Version 11
- Storage: 500 MB available space
- Sound Card: Any DirectX-compatible sound device
Recommended
- Requires a 64-bit processor and operating system
- OS: Windows 10/11 (64-bit)
- Processor: Intel Core i5-8000 series / AMD Ryzen 5 / equivalent
- Memory: 8 GB RAM
- Graphics: Dedicated GPU with WebGL 2.0 support (GTX 1050 / RX 560 or better)
- DirectX: Version 11
- Storage: 1 GB available space
- Sound Card: Any DirectX-compatible sound device
Supported Languages
Latest news
Patch NotesOfficial
Tutorial and balance changes
Tutorial ChangesOriginal prologue level 3 has been scrapped and instead overclock and recycle will be dynamic tutorials pop-ups.Prologue level 2 has been split into level 2 and 3 so that its less dense.Balance ChangesCapstone cost is not lower to make it easier to purchase.Normal mode will have slightly more time in between spawns to give players more time to ramp up.Read full article on Community Announcements (Lambda7Tech)AnnouncementsOfficial
Circuit Keep Demo Live!
The demo is liveCircuit Keep now has a demo on Steam. It is the opening of the campaign, and it plays like the full game. Hit Download Demo on the store page and start building. Your towers don't block anything. Enemies pathfind straight across the grid toward your CORE and walk over every module you placed. The only thing that makes them change direction is a wall. So you build the maze, line it with firepower, and force every wave down a path you chose. Then they start pushing back. What the demo includesThe opening levels of Act 1, played start to finish.Six module families that unlock one at a time: CHARGE NODE, PULSE DRIVER, FIREWALL, BURST EMITTER, JAMMING FIELD, and CHAIN ARC. Each has two branching upgrade paths you can switch any time.Four intrusion families that each break your defenses a different way: BYTE and SWARM flood the maze, PHANTOM cloaks itself, and DAEMON soaks everything you throw and keeps marching.FOCUS FIRE, OVERDRIVE, and OVERCLOCK for when the maze alone isn't enough.The RESEARCH GRAPH for permanent upgrades between attempts, and a tougher HARD star on every level you clear.The demo runs on Windows, macOS, and Linux. The full game addsThe demo is the on-ramp. Wishlist and get ready for the full game: three acts and 40+ hand-crafted levels, 12 module families, 12 intrusion families with 7 elites and 3 bosses, four damage types with status effects that stack and combine, and an ENDLESS mode with everything unlocked. Tell us what breaksPlayed the demo? We want to hear how your maze held up. Post in the discussions here or join the Discord. Join the Circuit Keep Discord Wishlist Circuit Keep to keep going after the demo.Read full article on Community Announcements (Lambda7Tech)
