Defend Earth from waves of alien invaders! Destroy all 55 invaders across 5 rows to advance to the next level. Use your 4 shields for cover, shoot the mystery ship for bonus points, and watch out — they speed up as their numbers dwindle.

1978 Arcade Original — Faithful recreation of the Taito cabinet: authentic sprite bitmaps, white invaders with the green cellophane overlay zone, red mystery ship, the four-note marching bass, and one shot on screen at a time — just like the original.