Unlock Secrets
In "Crash Twinsanity" you can access level secrets by collecting certain gems throughout each level. For instance, if you collect a level's blue gems, you can access boss gallery art; if you collect purple gems, you can view new concept art; and if you collect green gems, you will have access to enemy gallery art. In addition, collecting red gems will gain you access to storyboard material, yellow gems will allow you to access the "Unseen Gallery," and clear gems will allow you to rewatch the game's full-motion video sequences.
Easier Jumping
You can make it easier to jump between troublesome platforms by taking control of the camera with the right analog stick and positioning it directly above the platforms, making the distance between the platforms more easy to estimate.
Defeating Cortex
To defeat Doctor Neo Cortex, the final boss in "Crash Twinsanity," you must be careful to avoid his shots and bombs. When he aims his big green fire balls at you, you must wait until they reach you, and then fire them back at him by spinning. If you repeat this three times, Cortex will quickly fall.
Defeating Dingodile
To defeat Dingodile, a cybernetic combination of a dingo and a crocodile, you must be careful to avoid his fireballs. Stand on a mark, and then jump away quickly when Dingodile aims to shoot you. Eventually you'll see a button revealed. Quickly body slam this button to create a rain shower above the boss, which will distract him -- you can take advantage of this momentary lapse to attack him. Dingodile will then go into the next phase of his attack, using his flamethrower and spinning around at the same time. Double-jump to avoid the flame.
Next, Dingodile will power up to shoot a spinning wall of flame. Run around him, and you will have the time to run to another mark and body slam it. Attack him once again, and when he rouses himself, he will use the same tactic as before, except he will switch the direction of his bursts of flame. Wait until he powers up to launch his wall of flame again, go to another marked spot, and as Dingodile opens it, body slam the button that appears. When Dingodile is distracted, you can deal the final blow to vanquish him.