Blueprints:
     When  constructing  your  blueprints  to  your specially designed
weapons,  always  put  the  key  sheet  on  the bottom page facing the
opposite  direction  and  also  facing  upside down, and if there is a
crosshair, then it goes right above the blueprints.

Secret Egg-Launching Window:
     All of the windows are easy to find except for a singular one. Go
to  the  stage  where  the  Grinch is sucked into his giant cave. Just
before  you  go  under  the stone-filled arch and into the red vacuum,
change  your  view  to  look  above,  Where  you will find the missing
window..

Bonus Wrapped Presents:
     In  Downtown  Whoville,  you  will find a child that is afraid of
you.  Before he runs away, use your powered-up "bad breath" attack and
the boy will dissappear, revealing a 3 point gift!