I am having trouble in world 1-8 I get all of the bubbles poped and he turns red and dissapears. then a door opens and i go out the door and the score comes up. then i push the A button and it goes back to the main boared and it won't let me go on to the next sections. what am i doing wrong? do I have to get special things to get further, or what do i need to do?

hey dude, i'm experiencing the same problem.. my sister asked me to help her out.. and i'm thinking of everything possible.. but still can't get to the next level..

have you managed to do it yet?

1-8?!?!?!?!?!?!? you cant get by that?!?!?!?!?!?!?! just finish by finding ur way toward the boss intiill you see the red door and enter it. and beat the boss easliy.

The world selection is at the top of the screen. Once you have beaten the boss. A two should appear at the top of the level selection screen. press this, it is the 2nd world.

If you are refering to the question marks, they open up when you get 100 points on each level. A bonus challenge and an extra level replace the question marks.