The collars can also be removed by key cards used by the prison guards. While the threat of violence is constant at the prison, most prisoners enjoy a great deal of liberty inside Deadman Wonderland. Utilizing Cast Points, the prison's unique form of currency, prisoners can purchase a wide variety of items from ordinary lunches, luxurious furniture for their rooms, and even years off of their sentences. However, Cast Points can't be used to buy the freedom of a Deadman. Those on death row also use Cast Points to purchase their life-saving candies. Despite its identity as a prison and theme park, Deadman Wonderland houses a much darker secret. Hidden away from the eyes of tourists and the general prison population is a massive underground facility known as "G Block". This is where the prison keeps their Deadmen secluded and where the Carnival Corpse arena is located. G Block also houses numerous laboratories and rooms where experiments on humans are performed and where scientists are attempting to harness the powers of the Deadmen for monetary and political gain. Eventually, Ganta and his Deadman allies received the assistance of Makina, the chief of the prison guards, to defeat Tsunenaga Tamaki. Rinichirō Hagire in Toto Sakagami's body assumed control of Deadman Wonderland while Tamaki committed suicide. After Deadman Wonderland was closed, the necklaces were removed from the inmates. Most of the remaining inmates were transferred to different prisons where some of them were allowed a retrial. Makina later rallies the Deadmen on a mission to infiltrate Deadman Wonderland and activate the Mother Goose Program to completely seal the Wretched Egg (another name for the Red Man), with the resulting battle destroying most of Deadman Wonderland. Carnival Corpse Deadman Wonderland runs a secret gladiator-like game called the Carnival Corpse (also referred to as the Carnival of Corpses), where wealthy anonymous donors pay to watch death-matches between the prison's Deadmen. The viewers of the Carnival Corpse also place their bets on who would win. The winner is awarded a large number of Cast Points, life-saving candies, and other prizes. Deadmen who are defeated yet survive the game have a part of their anatomy surgically removed for scientific research which is broadcast as part of the Corpse Carnival Post-Game Show. In a cruel twist, the doctor spins a bird-shaped macabre slot machine to determine which part of the loser's body will be removed (with the