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Invisible Knife is a Tier 4 knife in Mad Games.
Despite there being an outline on the icon shown in the shop, the knife is completely invisible in-game. Even when thrown with Ghost Knife power activated.
The player completely disappears while a *poof* noise plays.
"There is no knife... Or is there?"
Since the knife is invisible, and nobody else can tell where the knife is going except you, this can give you a slight advantage in some gamemodes. This mostly benefits in Tile Smasher because with any other knife, you become more predictable, and players would know how to avoid you.