Boss Gate Key

      The Boss Gate Keys are special types of keys that appears in Sonic Generations. These keys are needed in order to open Boss Gates that are found in the White Space. Each Boss Gate found in the White Space requires three Boss Gate Keys in order to unlock them, making a total of nine Boss Gate Keys found in the game.

After both Classic Sonic and Modern Sonic restores the colors and space of all three levels found in a area of the White Space, the Boss Gate Keys will appear in the said area, but are surrounded by a barrier. In order to obtain them, the Sonics has to clear one Challenge Act Gate for each of the Boss Gate Keys found in their respective area. Once cleared, their barrier will be lowered and the Boss Gate Key can be obtained.