This classic shoot-em-up game features a particle engine used to create aliens, explosions and other onscreen effects. Multiple Levels, End of Level Baddies and Particle effects and graphics. Weapon bonus upgrades: Weapons: Single shot; Multiple shots; Star burst; Homing; Smart weapon Parallax scrolling backgrounds with merge effects. Hi-Score table Wave after wave of alien formations, Ground to air gun turrets, Bonus lives and Great sound effects