first, go to 4-2 and make your way to inside the temple










now go through the door on the left and out the window closest to the door on the right side
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now go down this little crevice thing and press this button on the wall
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now come back to the entrance of the temple, go down the right side and through the door
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pick up this thing, go to the roof of the temple and place the thing on the pedestal
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now go behind the starting area (you can walk on the sand now without taking damage) and head towards the glowing orb in the sky, underneath it is the level transition to the secret level

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if you're familiar with crash, you know that to 100% a level you have to break all crates in the level, that same idea is used here but instead as a reward you get the secret cheat thingy that lets you play every level in the game with this modifier

you can now one-shot (and get one-shot by) every enemy in the game
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:D