Another Gravity Falls monster that I came up with.

The Game Master. A possessed arcade cabinet that is programmed with multiple puzzle solving games and challenges. Anyone who beats the Game Master ends up going missing the following night. The next day a new game shows up in the Game Master's menu, and that game has a character sprite that highly resembles the previous winner. The challenges and levels are also NEVER the same. It also seems as if it's trying to always improve itself using the missing winners. As if it wants to become the perfect game.