TI Invaders


Developer Texas Instruments
Publisher Texas Instruments
System TI-99/4a
Release Date 1981
Mode Single player only
Media Cartridge

TI Invaders followed the usual Space Invaders formula pretty closely (what with the invaders being in a formation that would drop down a notch when they reached the edge of the screen, there are four bunkers for the player to hide their base behind for shelter, the appearance of the invaders resemble the ones from the arcade original, etc.) with only a few minor differences.

For one thing, the invaders were several colors, being red, blue and green, unlike with just being white on the arcade original (not including a color overlay to make them look green once they got very close to the player's base). When the player's shot from their missile base collided with an invader's bomb, their score would increase by one point (normally in Space Invaders games there is no score for an incident such as this). The remaining missile bases are encased in a large rectangle at the bottom of the screen, which, once the player's missile base got destroyed, the onscreen action would freeze while the destroyed laser base would be moved into the rectangle and stored to the right side, then the next missile base in reserve would be ejected from the rectangle. If the player scores 10,000 points or a multiple thereof, one of the missile bases will be repaired.

Also, in between each invaders wave, there is a bonus round where it is just the player verses the U. F. O., which, each time the player shoots it, it decreases in size and starts heading in the opposite direction, but at a quicker pace than before.

There are two skill levels available, being "merely aggressive" or "downright nasty"; if the player chooses the latter, the invaders are worth twice the points as on the easier level.


  • Bottom row invaders--5/10 points
  • Middle row invaders--10/20 points
  • Top row invader--15/30 points
  • U. F. O.--random
  • Hitting Invader bomb--1 point
  • Extra missile base--3,000 points
  • Missile base repaired--one every 10,000 points


  • Move laser cannon--joystick (left/right)
  • Fire--button


YouTube video of the game

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