If you try a game 3 times and and don't pass it you can go onto the next game.
Eg. I am playing Crop Stomper and I fail three times. Go into the coffee shop after your third try and the barista will talk to you asking you if you would like him to pass the game. When you exit the coffee shop the next game is unlocked. You can do this as many times as you like.

(note: 3 times isn't always the right amount but it is mostly. You'll know when you see an '!' at the coffee shop sign.)