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Generator Rex Games: Evo Showdown - Select a stage: ABYSSUS, MANHATTAN, CABO LUNA or THE HOLD. Use the arrows keys to move Rex and press the left mouse button to perform attacks. Switch abilities: Smack Hands, Slam Cannon, and B.F.S - press 1, 2, 3 button to switch weapons. Upgrades - Slam Cannon Levels - stationary shot (default) - stop to fire the cannon, standard - fire while moving, autofire - hold the mouse button down for rapid-fire, spread - hit three targets at a time. Combo - Chain Attacks - defeat enemy EVOs to unlock your chain abilities. Chain attacks together to maximize damage. Power-ups - pick up nanite power ups to temporary double damage. They wear off after 10 seconds of use (Combat Drill, Battle Saw).