When you get to a boss battle you must pass the boss to make it to the next level. At the top of the screen there is a Green bar and a Red bar. The Green bar MUST beat the Red bar for you to pass. If you fail you will be sent back 1 car and will just farm cash until you can afford to upgrade you car. Do a few upgrades and then click on the BOSS BATTLE button. You will be taken to the boss and if you've upgraded your care enough, you will pass.


That's the basics of the game. When you click on the shop you will always be taken to the premium page first. Everything on this page is bought with REAL money. Be careful where you click.