When you type in the word WOMBAT at the start screen it will give you all the gems and the special gems included. The game will be 106% complete. All the bosses will be defeated. The only the thing you have to do is get the gold in the time trials.

Alternate ending sequence
Collect all 46 gems to view an alternate ending sequence.

Defeating Crunch Time
Every time freezeballs, beams, or fire comes out, jump over the fence into the inside platform. They cannot touch you there, but fireballs will land everywhere -- just watch for their shadows. There is a series of elements you have to avoid. Then shoot Crunch with the bazooka and spin Cortex. The series is: fireballs, shoot Crunch, spin Cortex, freezeballs, fireballs, shoot Crunch, spin Cortex, fire, fireballs, freezeballs, fire, shoot Crunch, spin Cortex, beams, fireballs, fire, beams, freezballs, fireballs, beams, shoot Crunch, spin Cortex. If you win, you will unlock five secret levels for which you must collect a certain amount of relics in order to open the doors.

Defeating Lo-Lo
Watch where the mask floats and shoot there.

Defeating Py-Ro
Hold B to charge the water cannon or you will never hit.

Defeating: Ro-Ko
Roll around the side of the area without going in the center. Every rock will come near you, and Crunch will mostly miss you.

Defeating Wa Wa
When you are facing Wa Wa, crunch will shoot things at you. He will fire blue beams that you should jump over. When he fires green things, duck. Hop from one panel to another. When you reach Crunch quickly spin. Watch out -- the panels will sink. Try to get a head start on each run. Once Crunch jumps back at the beginning, run. When you spin him the next two times, do not stop running.