If you leave and re-enter an area (go through a portal then back into the stage you just left) all extra life hearts respawn on the level. If you go to say the mansion level you can get 2 extra lives per trip there (on second and third floor of the mansion). You can do this unlimited times (or until you get tired of doing it at least).

To get unlimited lives, pause the game and press X, R, L, A, A, X, Y, WHITE, B, L, R, BLACK, UP, UP, DOWN, LEFT, RIGHT.

It takes quite a bit of practice to master the course, hit the "afterburner" rings and line up the jumps PERFECTLY. Any mess ups at all can cost you the race. Jimmy cheats, so using these shortcuts will really help.

SHORTCUTS:
#1: Right after the race begins, at the firat left turn, Sweep wide around a log on your left and it will face you towards a pipe shortcut on the right. This will take you to the first jump.
#2: After going under the tree (the right side is the most direct route) the path will fork. Go to the right and hit the yellow “GATE” sign. This will open a gate that blocks a shortcut pipe. Do this during the 1st lap and use it every time.

First you got to get on fire and don't worry this wont hurt you- then go near the gascans=boom. they are still half alive so you pick up the gas and gas up the steamroller and run them over- this will open the portal to the next level.

On "The square" level talk to the Jazz man (in front of the museum) he will ask you if you have a trumpet. cause you don't you'll have to buy one. First climb the clock tower and jump on the plat form and change the time to 8:00 PM , jump off. in the back alley is a bird mask thing in the top corner there's a costume party go in the door and Vince will come out with money go to the clock and change the time to 8:00AM. now go to the pawn shop now change the clock to 11:00PM and go to the jazz club with your trumpet. Now go to the jazz man talk to him and hell let you in.

Once you get into the Museum, go around on the left and up the stairs (leave the hat alone for now). Once you are upstairs, switch all 3 levers, then continue left jumping down to the stairs. Now go back, grab the hat and head to the entrance. A bit of timing should help to show old Dino the light. Jump and glide into the now open center where the statue is to get into the next level.