Twinsanity Island (ダブルヘンテコドッキリじま lit. Double Strange Candid Island in Japanese) is the fourteenth level in Crash Twinsanity. It is an island in the 10th Dimension ruled by the Evil Twins and is also the hub level of the fourth and final world in the game. It is the 10th Dimensional counterpart of N. Sanity Island and home to the Ants, a race of robotic ants who act as the Evil Twins' soldiers. The island consist of volcanic mountains, lava caves, and the Evil Twins' stronghold is also located there, where the level Ant Agony takes place. The waterfall has the Evil Twins' faces carved into it, symbolizing their authority over the island. Also, the Tiki Statues look more evil on Twinsanity Island than on N. Sanity island. There aren't many inhabitants here, besides ants and Evil Crash. Good Cortex and Evil Coco live there too, but they were never seen in the final version of the game. There is also a secret cave at the left hand side that takes the player straight to Ant Agony and a portal that takes Crash to Iceberg Lab (in its 10th counterpart). Not useful unless the player wants to replay Rockslide Rumble.
- The music of this level is an eerie, hip-hop style remix of N. Sanity Island's music.
- The island is mentioned by Aku Aku when the player plays as Cortex in the Thumpin' Wumpa Islands level in Skylanders Imaginators.