Stage Select:
On the Island Map press Up, L1, L2, R1, R2 simultaneouly repeat this once 
more then press left and all the top buttons again. This will allow you to go to 
any stage you want.

O = Circle 
X = X 
V = Triangle 
S = Square 
The super password for the game with every crystal and both keys is: 
V V V V X S V V V V S X V O V V V O S V X X X X 
6% complete password OXSVOSSV 
11% complete password SSXSSVXV 
13% complete password XSXOXSVX 
18% complete password SSVXOOXV 
22% complete password OSSOOXXX 

DEBUG MODE:
1-at naughty dog logo hold up+x until you get to the tittle screen.
2-hold left at tittle screen while pressing s,c,s start
3-pause while playing then press down, x 26 times then down now every 
time you press select you get the debug menu!

To make crash dack himself and moon the screen, go up to one enemy and 
put in - x x x t t t L1 R1 L2 R2.
Note:It doesn't matter if you get hit while entering the code.