Galactic Attack (Atari 8-bit Cassette 50 Game 2)

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It’s reassuring to know that, in the event of an alien invasion of earth, we could be saved by merely guessing (to within 10) how many aliens are coming to get us.

See the Commodore 64 version
See the Dragon 32 version
See the Acorn Electron Version
See the ZX81 Version