This Game has gone over major changes over the past years. Unlocking bikes by doing certain challenges was pretty awesome and that's what made this game entertaining. But they decided to throw that away in the latest patch which the only way to unlock bikes is to get stars. I'm one of those people who like to get 3 stars on all the levels and this game pretty much forces you to do it if you want all the bikes. All in all still a fun game. Just need to get used to the new mechanics. 4/5