Go to bottom level and pull out three of the rugs on the wall, you will notice them from the size difference.
Another way to look at gadget building is by the thickness/white color of the lines. The left side has the most color, the bottom has ALMOST nothing, the right side has skinny and has slight color and the top part has just a little bit of color. This will help you.
Look at the perimeter. The lines have to be aligned right. Once you done that, here is the hard part. You have to figure out where the middle pieces go. You can tell if they need to moved of not. There is a long squiggly S. If they are in the wrong place but the pieces are correct, try moving them if you are trying to build the Marine Mobile or Grinch Copter. Don't get on the sides though. Good Luck.
Destroy the following number of presents to get the indicated mini game. Go to the upper level of Mount Crumpit to play the games.
750 presents - Spin N Win Mini Game
1,500 presents - Pankamania Mini Game
2,500 presents - Copter Race mini Game
3,000 presents - Bike Race Mini Game
Shoot the kids with an egg launcher, presents will pop out of them and they will run away.
To get into City Hall shoot the big clock with the Rotten Egg Launcher and the door will open.
When you need to slime the Mayor's skis you can shoot the snow from the peak or on the side of the roof onto the dog to stall it for about 15 seconds.
Binoculars - whoville - 4 blueprints
Rotten egg launcher - whoville - 4 blueprints
Rocket spring - whoforest - 9 blueprints
Slime shooter - whoforest - 9 blueprints
Octopus climbing device - the dump - 9 blueprints
Marine mobile - wholake - 16 blueprints
Grinch copter - every level - 16 blueprints
In the Who Forest level complete the beehive objective. You know putting beehives in people's roofs. The whos will run away and you can enter their houses!!!
To show the security beams in the mayors statue's room all you have to do is breathe on the beams to show them up.