This area is optional, and the only way you'll ever find it is if you gathered all seven pieces of the map. You start the game with one of them. Another one is available to purchase from the in-game shop, once you complete your first proper stage. The remaining pieces are available throughout the five levels. When you grab the final piece, you should be taken immediately to the bonus stage.
When you enter the Under Ground area, you'll see two treasure chests resting on a ledge to your upper right. One contains a large diamond, the other a red diamond. Now drop down and pogo through the corridor, where you'll find a crab waiting just to the right. Pogo off it, then continue forward and knock the raft into the water. Stand on it and push off from the wall to the left.
You'll now ride the raft toward the right. At this point, look near the top of the screen as it scrolls. You'll see a hovering hand here. If you wish, you may pogo off it, up to the ledge above (there's a lower path here, too, but it's more difficult and I'm going to pretend it doesn't exist for the purpose of this guide). Walk right and you'll see a chain, and also a wall that blocks a treasure chest with a large diamond. Collect that, then climb the chain leading upward.
In this next room, there's a large treasure chest to the left that contains a red diamond. Grab that, then move to the right. You'll soon come to a pool of water, with a red ledge hanging in the air above it. Leap to the ledge, but be prepared to pogo quickly to the right along other such ledges (they drop into the water shortly after you step on them). The fourth such ledge is lower than the others. You can land on it, then walk through the wall to the right to find a hidden treasure chest that contains a red diamond.
Grab that, then hop right and knock the next raft into the water. Around this point, you should also see a hand floating down from the left side of the screen. Avoid it and give the wall a knock so the raft glides right. While you ride it, be careful to duck so the upper ledge doesn't knock you into the soup. Be ready for a treasure chest hanging in the air to the right; it also can knock you off your perch. Hop onto it and break it open for a red diamond, then move right to the chain and descend into the room below.
There are treasure chests here, and a false floor. Hold to the left or you'll fall through the floor and miss out on the red diamond in the treasure chest to the left. When you've grabbed it, hop over to the right so that you land just ahead of the red block. Otherwise, you'll fall through the false floor. When you land ahead of the block, bat it to the right so it drops into the abyss. Then follow it down to the next screen.
Grab the treasure along the right side of that screen, then pogo left along spikes. You should reach two treasure chests on that ledge, which hold an ice cream cone and a large diamond. Further left, there is a frog between some block columns, and then a chain. Before you descend the chain, walk left through the wall and break open a large chest for a red diamond. Now return to the chain and descend it into the next room.
Here, you'll see a soldier patrolling. Hold against the left wall, and pogo off the soldier's back to fly through the upper segment of the wall. You'll find a treasure chest here with a 1-up doll. Grab that and some other diamonds, then move back right. The soldier is back, so defeat him and continue right past a disembodied hand, to another soldier. Bounce off him to the ledge above, and walk right. Descend the chain against the wall to your right and break open the chest that waits at the bottom for a large diamond.
When you've grabbed that diamond, knock the raft off the ledge to the left, into the water. Stand on it and hit the wall to the right. Now duck as you ride the raft left (duck immediately, or you'll fall). Partway left, there's another ledge in the air. Hop onto it and drop onto the raft again and continue riding left.
At the wall, pogo left and take out the crab, then continue left. You'll see a treasure chest on an upper left ledge, and another should appear just to its right. The uppermost one holds a large diamond, the other a small one. From there, you can head left through the narrow opening to grab an ice cream cone and face the area boss.
Duck Wizard
The boss here is the same as the boss of the Scotland level, with only a few modifications. You've probably not yet fought that fellow if you closely followed this guide, so here's the basic strategy.
Basically, all you have to do is pogo around while the duck wizard materializes in two hazy forms, one to your left and the other to your right. Though in Scotland he has two different attacks to avoid, here he has only one. After flickering between the two spots, he'll solidify randomly in one or the other. If you're near, be ready to pogo on his head.
You need to be careful to avoid his magical blast, though. It goes at about head level, and if it hits you it will turn you into a frog. If this happens, just hop around and let the additional bursts of magic pass overhead. You'll return to your true form shortly. Just repeat this strategy until you've managed to pogo your enemy on the head five times. Then you'll win the treasure of McDuck.
NEXT: Glomgold's Ship
