Boss Lab: Robot Battle Builder

Build your own battle robot. Give it a brain. Turn a crushing defeat into your next winning design.

Boss Lab is a robot building and fighting game where your creation is the boss. Assemble a mechanical monster in the Workshop, test it in battle, earn parts and come back with a smarter build. Your weapons shape the strategy, and your timing can turn the fight around.

Build a boss that fights your way Choose a chassis and combine weapons, movement parts, armor and gadgets. Create a close-range brawler, a ranged attacker or a machine built to counter your next opponent. Mix and match more than 60 parts, upgrade your collection and experiment with new combinations.

Give your robot a brain Choose how your boss behaves in combat with configurable Brains. Pair its behavior with your weapons and movement, then watch your design face the test. Spot a weakness, change your loadout and try another approach.

Time your turning point Fights unfold automatically while you choose when to Dash, activate Overdrive and unleash Rage. Robot battles reward both preparation and well-timed abilities. A different weapon, a better counter or one decisive move can change your next attempt.

Take on the Campaign Fight through 100 Campaign stops across 20 districts. Face mechanical bosses, earn Scrap, collect parts and upgrade your machine. Adapt your build as new opponents challenge your strategy.

Challenge saved bosses in Arena Battle other players' saved creations in asynchronous Arena PvP, without needing to be online together. The same boss you build for Campaign also faces Arena challengers. Ranked battles normalize part levels, putting the focus on your loadout and strategy. Arena battles have no energy cost.

Make every rebuild your own Personalize your machine with finishes and face decals. Keep the parts you love, rethink the ones holding you back and build a boss with its own personality.

One boss. Your build. Your next breakthrough.

An internet connection is required for main progression.