I do not understand video games, so this one is unclear to me. An "x" through Luigi, a Raving Rabbid below. He said something about his room being Luigi's mansion. It's cute though, and he is very proud of it.
This one though? This is genius:
It's a keypad. You have to "type in the code" by writing the numbers in the rectangle with the crayon that he has conveniently taped beside the code box.
His bedroom door:
And more baby cuteness:
Nick loves to stretch. He regularly looks like he's doing the Superman: