To Unlock 'Bear' go on to a championship race (the final 1) when you reach cyber feild 2 look at for a platform in the midle of a hole. You will be able to get across when you are across you should get the blue diamond. when you finish you will have bear in choose car section.
To Unlock 'Roketee' (said rock-er-tea) star on the first championship and when you get to Moon road you will be able to get roketee. As you aproch the first corner get the blue power up. when you get to the first jump use the power and steer right!! You will see a platform try and land on it and you will find a blue diamond on it. Retreive the diamond and continue the race. When you next come to choose a car roketee will be there!