Machine Guard Corps is a free browser sci-fi lane defense auto-battler. Your command base sits on the left, an alien hive on the right - summon five kinds of machine units, buy permanent evolutions, upgrade your Command Tower and turret, and use three active skills to hold the line. The hive is not a fixed wave script: it manages its own energy, upgrades itself, and eventually sends boss after boss, then double-boss rounds. About ~130 KB, no install, no account.
Want a faster, timed arcade game instead? Try Black Cat on a Hot Tin Roof.
Summon machines, evolve units, and defend your base from an adaptive alien hive. From Machine Guard Corps by Mars723 (MIT). About ~130 KB, downloads once when you press Play.
Number keys 1-5 summon units, or use the on-screen buttons. Works with mouse/touch alone.
Welcome to Machine Guard Corps - a free browser sci-fi lane defense auto-battler you can play without an account or install. Press Play to load the ~130 KB game in a same-origin iframe, then press Start Defense on its own title screen. Summon Robot Infantry, Mech Dogs, Attack Drones, Big Fat Bots, and Railgun Walkers with number keys 1-5 (or the on-screen buttons); spend Scrap on permanent unit evolutions and on Command Tower, Base Turret, Coolant Banks, and Combat Firmware upgrades. Use Missile Strike, EMP Pulse, and Repair Swarm to swing tough fights. The alien hive manages its own energy and upgrades and eventually sends named bosses - win by reducing the hive's core HP to zero before your base falls. Privacy note: nothing leaves this device except the initial page and game files from this site. For more free browser games, open the games hub.
Frequently Asked Questions
What is Machine Guard Corps?
A free browser sci-fi lane defense auto-battler: defend your command base from an adaptive alien hive by summoning machine units, buying evolutions, upgrading your base, and using active skills.
How do I control it?
Number keys 1-5 summon units, Q/W/E trigger skills, Z/X/C/V buy upgrades, and Cmd/Ctrl+1-0 buy evolutions - or click the on-screen buttons for every action, so mouse/touch alone works too.
What is the goal?
Reduce the alien hive's core HP to zero. You lose if your command base HP reaches zero first. The hive sends progressively stronger named bosses over time, then double-boss rounds if the fight runs long.
Is progress saved?
This build is session-only. There is no save data - closing the tab resets the game.
How big is the download?
About ~130 KB of HTML, JavaScript, and CSS after you press Play. The browser caches it for later visits on the same device.
Does it work on a phone?
Yes - every action (summon, skills, upgrades, evolutions) has an on-screen button, so it is fully playable with touch alone.
Is this open source?
Yes. Adapted from Machine Guard Corps by Mars723, under the MIT license. This site build adds noindex on the engine page and ships LICENSE plus CREDITS next to the engine.