Hey, just surfin’ around and found this!
http://www.bbc.co.uk/cbbc/games/games/uni.html[COLOR=red]
It’s not a classic - but it’s got a unicyle in it!
Enjoy 
hmm, has anyone really tried unicycling with a goldfish bowl on your head? while jumping over fire? how about on jupiter? Wow, this game has opened my eyes to a whole new level of unicycling. I can’t wait to try it myself!!