Four
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4, but 5 if you are counting the test track on one of G's missions.
There are a total of 4. Each varying in difficulty.
press your space bar
Well, if you want to use the sled you can play sled race at the mountain.
None of them do. Puffle Rescue, Hydro Hopper, and at a certain point in survival mode if you have the silver surfboard Surfing does too.