Demolition Derbies featured a square plastic playing area with handles on a pivot. The car had a ball bearing in and you had to guide it around the arena knocking (elastic band loaded) flat plastic "cars" up into the air. Racking up the most points and back into the pit before the clockwork timer swing door shut. I got this one Christmas and thought it was the best thing ever (better even than Pocketeers!).
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