Seriously: Grinding 4 to 7 million credits to fully upgrade a single vehicle? I'd understand if you want to fully upgrade the higher tiers - but seriously: For a bike? Really? Sorry. Even if you manage it to only get 500$ creditcoins, you'll never be able to grind that much. Never. I saw your credits, but why is the .SOL-file names "HillClimbRacing.sol"? Any explanation? For all: Yes, I modified the .SOL to write this comment & to inform you all, that you'll never be able to fully upgrade a single vehicle in lifetime.