Hold the line against the rogue salvage swarm.
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Rogue machines march down the glowing track toward your reactor core. Each one that reaches it costs core integrity. Lose all 20 and the reactor melts down.
Pick a turret at the bottom, tap an empty tile to preview its range, then tap again to build. Tap a turret to upgrade it as many times as you can afford (each upgrade past Mk IV costs more) or sell it for 70% back. At Mk III each turret takes one of two paths for good. Turrets also learn on the job: at 10 kills a turret becomes a Veteran (+5% damage) and at 100 kills Elite (+15% damage, +10% range), shown by gold chevrons.
New turrets unlock as you go: the Slag Burner on level 3, Flak Battery on 6, Overclock Relay on 9 and Focus Laser on 12.
Start wave early to earn bonus scrap. Tap 1× to speed things up, up to 16×. Every level ends with the Overlord: no single turret can hurt it much and it repairs itself, so you need many turrets. Finish with 18+ integrity for ★★★, 10+ for ★★.