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bison casino's Space Invaders aliens fire downward projectiles toward the player gun, the game demands both offensive targeting of the formation and active defensive dodging. Alien fire rate increases in higher waves, reducing the time the player can hold a fixed position to aim for a high-value top-row kill or UFO shot. The four shields above the player gun absorb incoming alien shots, creating covered zones to fire from, but each shield erodes with every hit until it is gone entirely. A shield powerup dropped by aliens can temporarily restore protection when physical shields have been fully destroyed, extending the window of defensive play. Space Invaders is fully offline at 60fps; no registration is required and all session data saves locally.