Circuit Breaker
In the cyber-future of 2009, the most popular sport has become arena fighting. Challengers from all over gather to attempt to conquer gauntlets of robotic opponents for fortune and fame.

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Spin the slot machine for rewards and bonuses that improve your odds, then strengthen your defenses against waves of enemies. Turn lucky opportunities into upgrades and combine luck with strategy to build a stronger defense.
Released
October 2, 2025
Price
Platforms
macOS · Linux · Windows
Developer
Publisher
Last sync
September 30, 2026
Slot Machine Defence is a defense game about using slot-machine rewards and favorable odds to grow stronger and hold back incoming enemies. Your choices and upgrades turn each opportunity into defensive power. The new main mode and Classic mode share this core concept, with their own combat and progression systems.
Experimental game mode
IMPACT is a new game mode currently in an experimental stage. Its gameplay, content, and balance may change with future updates.
A new battlefield. Boulders you aim. Launchers that fight alongside you.
A new main mode has arrived in Slot Machine Defence. Break robot formations with physics-driven combat, customize your launchers, and build lasting upgrades. The original game remains available in Classic mode.

Take aim at the approaching robots and fire. The main mode in Slot Machine Defence is a 3D physics defense game built around collisions and knockback. Start with a launcher you control, then build a defensive line where multiple launchers fight alongside you.
Click to fire a boulder, or hold and release for a powerful charged shot. Boulders shove enemies aside and change course as they collide with walls and wreckage. Increase their mass to push deeper into a formation, or take out an explosive carrier to set off a chain reaction among nearby robots.
Small robot swarms, charging attackers, and shielded enemies that deflect frontal boulder hits call for different tactics. Interrupt a charge with a hit, aim around a shield, or unlock an area smash to break up a crowd. Preview the next stage's enemy formation and prepare your defenses before the fight.
Spend scrap from defeated enemies on damage, reload speed, boulder mass, size, and blast radius. Strengthen the shot you have now, or save for another launcher. Unlock automatic launchers in the skill tree, then spend scrap to deploy up to four. They find their own targets while you line up your next shot.
Learn weapon types such as rapid-fire, siege, and explosive modifications in the skill tree, then equip each launcher. Combine frequent shots, heavy boulders, and impact explosions, and freely swap between the types you have learned during preparation.

Clear stages to earn skill points, expand your skill tree, and reassign points to try different combinations. Defeat preserves your scrap, confirmed skills, equipment upgrades, and automatic launchers. Adjust your setup and take another shot at the stage that stopped you.

The original Slot Machine Defence remains available through Classic mode in the main menu. Spawn and strengthen weapons with a few clicks, then hold back incoming enemies as your weapons attack automatically.

Spin the slot machine to earn rewards and build up your strength. Make use of lucky opportunities and choose upgrades to prepare for the next attack.
Your weapons attack automatically, but keeping them upgraded remains essential. Enhancement can succeed or destroy a weapon, and there are ways to improve your chances of success or reduce the risk of destruction. Weigh the risks and opportunities as you build your firepower.

Check your statistics during play or after the game ends. Review your results and consider your upgrades and strategy for the next attempt.