Mattel's Gravity (19xx, LED, 9 Volt, Model# 8291) (Pre-production
U. S. Patent # 4,306,716, 4,322,074 and 4,364,619 (circuit connections)
U. S. Design Patent # D261,669 (patent for the look of the game housing)
Invented by: Tim Effler
Programmed by: Peter Oliphant
Originally called Catastrophe during production, but the name was changed before it was released. (See Catastrophe for possible reason for name change.) I don't believe this was released in the U.S., all the ones I've seen have bi-lingual manuals.
Do I have this? Yes, boxed.
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