Mighty Bomb Jack/Stage 11

Section 1
As soon as you start this level, you may be tempted to explore what's on the other side of the door that opens up in the floor. Don't do it. It's a one-way ticket back to Stage 6. The only reason you might possibly want to do this is if you missed the first crystal ball in Stage 7.

Section 2
There is a secret slavery room in this section that can be quite difficult to access, but it's worth it for the extra life, especially if you're playing the American version, or you're playing the Japanese version but you didn't collect the extra coin at the end of the first section. In order to open the door to the room, you have to collect the bombs in the proper order (indicated on the map) so that you end up collecting the 10,000 point bomb collection bonus. Unlike many of the difficult secret entrances that were made easier to find in the American version, this one wasn't, so it's the same for both. Once you're in, you must generally attack the blocks on the right side of the structure to get low enough to rescue one of your brothers and earn an extra life. There's a hidden Mighty Drink under the right-most block near bomb location 5.