At the Naughty Dog logo hold Up + X until the 'Title' screen appears. Hold Left and press Square, Circle, Square, Start and then pause during gameplay and press Down, X (26 times), Down. If you have entered the code correctly you will hear the sound of a snort and the game will resume. To display the 'Debug' menu press 'Select'.
On the main menu go on cheats and type this in: Triangle triangle triangle triangle x square triangle Triangle triangle triangle square x triangle circle triangle Triangle triangle triangle circle square triangle x x x x
To access everything go to password and press triangle triangle triangle square circle square x x triangle triangle square x triangle circle square triangle square circle triangle triangle triangle circle circle.
P.S. You will only get thirty out of thirty two levels
In crash bandicoot 1 when you first turn it on go to 'Passwords" and type in (t is triangle, s is square, x is x, and o is circle) t, t, t, t, s, x, t, t, t, t, x, s, t, c, t, t, t, o, s, t, x, x, x, x
Then you will have acess to all 3 islands, and all the levels and secret stuff that wasnt there before like in the level Castel Machnery, check it out!!! and you have all the crystals, too!
"Hidden Planks." On the level "High Road" instead of going forward go backwards and get the apple then jump then go forward then jump then do the same a couple more times then there will be lives at the end.