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About game
The steel frontier is under attack by robots, and it’s your job to protect it. Purchase turrets, combine similar units, and position your most powerful cannons in the front line for active defense. Set up and improve mines, withstand the escalating threat of incoming waves, and brace yourself for a tough boss battle every fifth stage. The campaign features 50 waves, 50 different enemies, 12 levels of turrets, and 6 levels of mines. If you fail, the current wave will restart without losing your built defenses or progress. Stand your ground and repel the final assault to safeguard the frontier!
How to play
Purchase turrets using the cannon button. Combine two turrets of identical levels by dragging one onto the other to produce a more powerful unit. The leftmost columns serve as storage for inactive merges and do not participate in the battle. Position your upgraded turrets in the active row alongside the wall—only turrets placed here will engage enemies within range. Use the mine button to set traps on the battlefield, and enhance them by merging identical mines. Initiate each wave yourself or let it start automatically after 20 seconds. Ensure the robots stay away from the wall and defeat all 50 waves.