Joe Danger's bonus stages force you to play as a certain character. Don't try and restart these levels: the character will change, and you will be locked out until you can afford the new skin. There are two ways to jump in Joe Danger. You can tap the screen, or you can hold your thumb down (to duck) then let go to bounce up. Use whichever works for you. Get into the habit of doing a trick whenever you do a big jump, and doing wheelies along flat ground. These will increase your score, and help you beat your pals on the leaderboards.