Another Puzzle World
When the Title screen appears, press Start to get to the manu with game Start, Time Attack, and Options. Now press R1, Up, L2, Down. A little character will appear in the right-hand corner of th screen. Highlight Game Start and choose it. In the game select under puzzle game will be another option called "Another World." Choose to play the Puzzle Game and you will be trying to complete a new set of puzzles similar to the originals.
Character Select
You can choose to play as other characters than the standard dinosaurs in the Puzzle Mode. Just choose the Puzzle Game from the Selection Menu and when you're on the Map Screen, press Left, Left, Up, Down, then L1 + L2 + R1 + R2 simultaneously. A special character selection menu will come up. Cycle through the characters with the pad and choose a character with a button. You'll play the next round with the character you've chosen.
More Credits
From the Title Menu, choose Options. In the options menu, press Left, Right, R1, R2, L2, L1, Up, Down. A timer counting down from 30 seconds will appear. Highlight the Credits option and press the X button quickly and repeatedly. Your credits will build up quickly at first, but then they'll be harder to get as you accumulate more. you may receive up to 30 credits, depending on how quick you are.