Alien Addition box art for TI-99
Alien Addition screenshot 2 for TI-99
Alien Addition screenshot 3 for TI-99
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$14.20
Loose $4.60
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Alien Addition

Alien Addition

(TI-99 - US, Educational)
Developed_By:
Educational Information Systems Inc.
Published_By:
Texas Instruments Incorporated
Released On:
01 Jan 1983
Alien Addition is an educational game that combines maths problems with the action of shooting down aliens in space. The player controls a cannon along the bottom of the screen, moving left and right to shoot down the alien spaceships as they appear above him. There are five ships in a row, descending down the screen one by one, each with a maths problem on it. To destroy a ship, the player must enter the correct answer for the previous ship before it reaches the bottom. If any ship reaches the bottom, the game is over.
The gameplay involves shooting down the aliens while solving maths problems, making it both an action and learning experience. The game runs for a fixed time, which can be adjusted by the player, as well as their skill level (1 to 9) and problem range (3, 6 or 9). This adds a level of replayability and challenge to the gameplay.
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Media Type:
Cartridge
Minimum Supported System:
TI-99/4a
Number of Players Supported:
1 Player
Input Devices Supported/Optional:
Keyboard
Controller Types Supported:
Digital Joystick
TI-99 Platform Trends
US Regional Pricing
Prices as of 30 Jul 2026
Typical $14.20–$14.20 (last 90 days)
2022202320242025202605101520Complete: $14.20Loose: $4.60
New
Complete
Loose
Box
Manual
Smoothed
Log · Auto
Medians
Market activity: thin · about 2 sales a year
Activity is a 12-month sales count. Dashed segments rest on two sales a year or fewer.

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