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Well I haven't played Cro-Mag rally but I did purchase Crash racing and I can vouch for Crash; it's a really good game. From the pictures I thought it looked better so I chose it over cro-mag, which is what I'd recommend.
 
They're both great games, but I personally prefer Crash. It is more fun because the levels are more intricately designed with lots of traps, speed boosters, hidden passageways, obstacles, etc. I guess I prefer the island/ space themes more than the medieval environments in Cro-mag. You could always get both.
 
Crash Bandicoot is a much better game!! - I have both and Crash is the one that gets the most plays these days!
 
Definitely get Crash. I bought both and I don't play Cro Mag Rally anymore. The gameplay is harder and crash is more fun and easier to play :D
 
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