You start at Rookie difficulty challenge in career mode and you have to unlock the other difficulty levels by being the world champion for the race season. If you manage to be champion in Rookie difficulty level (you should as it was very easy), then the game unlocks the Pro difficulty level.

The other two difficulty level where Champion and Legend where in Champion and Legend level, winning requires more than just fast bike. You have to be perfect in everything to be a winner. And computer controlled riders also not only are doing their very best, but sometimes block your way or even worse, hit you from behind so that you’ll crash. Racing as in real world was held in a dry or rainy day. Raining would make it harder for you as you brakes and tyres wont grip as good as in hot temperature. Winning championship point also would unlock some of the game hidden feature such as wireframe and cartoon mode and the one that I like most which is six mini silly games that really hidden from the game menu. In order to be able to play them, you have to read the game credits and while the screen scrolls down, at one point you have to press ‘enter’ key to unlock them.

From up to down, 1. momma! Help me!, 2. call an ambulance quick, theres a dead body lying here.