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PROTIP: Always try to buy ramp height, fuel etc. in BULK. I.e save up, and select two or three stages ahead of where you currently are. WHY? Each upgrade has a fixed price. To get from 0>2 you need e.g. $25 AND $50=$75. To get straight to 2, it still costs just 50$. THUMBS UP SO PEOPLE CAN SEE :D
Under rating threshold (hideshow)
I beat the game and it said click on the penguins beak to unlock everything in the game I don't know if it works though