Started Fun, Became a Pay-wall. This game is fun and charming, but it quickly changes its tune and starts to require money spent to make levels more plausible to accomplish. Gold should be more accessible in game, albeit earned at a slower rate if boosters are a necessity (races are too slow if you're stuck for ages on a level) Higher levels shouldn't revolve around boosters and should be based on without them. Levels 1-150 I recommend, but I would dump it thereafter.