NOTE: This only works if you're already fought the boss you wish to visit.
Level Instructions 3 Beat level in the given time (Hint: when you go to the bonus, die right away. This gives you more time.) 17 Take the death route. 21 Take the death route. 23 Take the death route.
TURTLE WOODS (Blue): Get no boxes.
THE EEL DEAL (Green): Go past the dead end in the Nitro box filled room.
PLANT FOOD (Yellow): Get no boxes and beat the timer.
BEE-HAULING (Purple): Go up the stairs of Nitro boxes.
1. BEAR DOWN: The small ice floe at the end of the stage.
2. AIR CRASH: The 2nd river. Don't jetski, but jump on the boxes to the platform.
3. UNBEARABLE: When the cub bucks you off, go back until you see him again.
4. HANGIN' OUT: when you drop down a hole into some eel-less water, go into the foreground and drop down the hole. (Pssst....use R1 to make Crash pull up his legs.)
5. DIGGIN' IT: Near the end there is a spitter plant on a circular platform. Bellyflop onto it.
6. TURTLE WOODS: When you find the stone face in the ground, belly flop on it to enter a bonus-type level. Be careful though as you can die in this one.
Right before the first "Check Point" box in Turtle Woods there is an octagon on the ground with a menacing face. Belly-flop onto the face and Crash will fall right through it into a new level.
In the "UNBEARABLE" level, when the second bear falls off the bridge, go back and jump into the space where he fell. This should take you to a level with turtles and enemies who shoot at you.