Invinco

Invinco challenges players to defend against waves of descending aliens in this vertical shooter from Sega, released in 1979. Drawing inspiration from classics like Space Invaders, Invinco introduces unique alien behaviors designed to test a player's reflexes and strategy. The invaders aren’t uniform; some blink in and out of view, others roll to alter their vulnerability, and still others require multiple hits to destroy. A particularly dangerous type transforms into bombs that threaten the entire playfield. Players control a stationary laser cannon at the bottom of the screen, maneuvering it left and right with a joystick to target the advancing aliens. Scoring is based on the color of the alien destroyed, with higher-value targets appearing in the upper rows. UFOs occasionally appear as well, offering substantial point bonuses when vanquished. Careful timing is key—some aliens exhibit invulnerability periods, while others demand precise aiming to avoid wasted shots and potential destruction. The game utilizes a Zilog Z80 processor for its gameplay, displaying action on a 224x256 pixel vertical screen with a refresh rate of 60 Hz and a palette of 64 colors. Invinco offers a single-player experience requiring skill and adaptability to overcome the increasingly complex alien formations.