Hum, it was in BASIC (not even on a proper computer, it was more like a big calculator). I was maybe about 10-11 years old.
All pick 2 random numbers between 0 and 10 and ask you what their product was, and checked if it was right.
Catch: you could only have one program at a time. If you want to make a new thing, erase everything first!.
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