Go to the shop with all five stars and over a hundred pounds, and buy another star. You'll get an extra hundred pounds. You can achieve the same by getting the balloon back to the shop and buying another balloon. This can be done as many times as you want.
A secret room on the first section will warp you to any level in the game. Simply buy the token from the shop and exit as the body. Now go down the well and enter the Gents toilets. Use the token on the bubble gum machine and you'll fly up to a secret room with another Gents toilet door and an exit. Go through the Gents, then you'll appear in a room with a Ladies and Gents door. Go over to the right and enter an invisible door (Go to the far right and it should be found there). Now go through the Gents to the following patterns to enter the desired section of the game.
The directions for the various choices are given below. If you choose the wrong door or wish to return to this screen, go through the invisible door on the right.
LADIES (L) MENS (M)
ROUND 2 L M M M L
ROUND 3 M L L M M
ROUND 4 M M L M L
ROUND 5 L L L L M M
ROUND 6 L L M M M L
ROUND 7 L M M L M M
ROUND 8 M L M L M L
ROUND 9 M M M L M M
CONTINUE: ---- M M M M L L
SOUND TEST: -- L L M M L L
SUB GAME: ---- M L L M M M L