UPDATE: GET WHATEVER HIGH SCORE YOU WANT! Use the ARROW KEYS to avoid the cars and the jet. Every 25 seconds your world will change. When you are in the Underworld, your keys drive the opposite world: You can create a Paradox between worlds when you hit an Underworld car and it teleports you back to the Overworld. (It's hard to explain but it's my only justification to a glitch that is in the game.) There is a secret... It may be usefull, but it may be not...
Once again CREDIT GOES TO ZEPY (I just changed the code to make the car immune to the cars and jet. And the helicopter ;D