In jet-pack adventure there are some hidden 1-UPs on levels 2, 3 , 4 and 5 to help you complete the game. On level 2 it's right at the top of the screen some way along, on level 3 it's left of the tree near a windmill, on level 4 it's in the pit left of the landing sign and on level 5 it's near the right side of the pit in a cave to the left. There's a different way to beat the game though, if you manage to complete the game without collecting any coins and using all your fuel up on every level you get 1000 coins!