Jailhouse Croc

Jailhouse Croc is the second secret level of Castle Island. It can only be accessed for those that have collected all 6 Gobbos from Ballistic Meg's Fairway, Swipe Swiftly's Wicked Ride and Panic at Platform Pete's Lair. This level contains the 8th and final jigsaw piece needed to unlock the Crystal Island.

Walkthrough
Follow the path of crystals through the dungeon. After you turn the first corner, watch out for the Devil Dantini in an alcove on the left side. Once the row of crystals ends, there are two more on either side of the room. You can easily just run straight forward to the door and avoid them.

In the next room, not only do the platforms crumble, but so do the blocks between them. Don't dawdle anywhere, just keep lining up your next jump and taking it. Enter the door at the end. In the next room, the blocks all crumble too. To get the crystals over each block, jump to the first and walk forward to the second before jumping off to the next block. Ahead, just move diagonally across the row of crumbling blocks to the end. Enter this door to find yourself in another dungeon.

Inside, just follow the row of crystals again and keep moving. When you turn, the rooms that open up have Devil Dantinis in alcoves in the sides, but you can just avoid them again. At the end of the path, you'll find the puzzle piece, the last one that you need.

Trivia

 * This is the last secret level and contains the last Jigsaw Piece in Croc: Legend of the Gobbos.
 * There are two stone dragon statues that are seen in this level. They are later seen behind the Secret Sentinel/Crystal Dante when he is revived in the last level of the game, Secret Sentinel on the secret Crystal Island. Therefore,  it is possible that they may have resurrected him or that they may be the guardians of his tomb.
 * Even if the player obtains this jigsaw piece and they don't have all eight of them, the clip of Croc assembling the 8 pieces on Castle Island will still follow after completing the level.
 * The name of the level is a pun on the famous rock song by Elvis Presley's 'Jailhouse Rock'.