It is a common misconception that all DLC for TTT2 was character-based. Perhaps the most vital piece of DLC was not a fighter, but a stage. The haunting, atmospheric stage known as "Unknown" (where the final boss battle takes place) was not included on the disc by default. It was provided as free DLC. If a player acquires a used copy of the game today and plays offline, they will notice that selecting the "Unknown" stage results in a default随机 (random) background. To get the actual stage with its iconic music and visuals, the "Unlock Unknown" patch is required.