The Crystal Sly Mask is treasure that can only be obtained in Sly Cooper: Thieves in Time (What If Edition) and Sly Cooper: Age of Thieves. This treasure will only be collected once the special boss in a specific mission is beaten. In Age of Thieves, however, it can only be obtained in Out of Touch, Out of Time if the Cooper Gang can beat the level without dying once. It makes everyone's binocucom's look like how they did in the first game, and it also unlocks additional skins: the Conner Cooper Skin, the Jim McSweeny Skin, the Dr. M Skin, the Constable Neyla Skin, and the Black Baron Skin.

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