The Mask Trilogy is the nickgame given to a group of games created by Wolfgang Kramer and Michael Kiesling.
All the games in the group have similar mechanisms but different themes. They all have a mask on their cover, thus the nickname.
All of the games in the Mask Trilogy (and Torres) make use of the Action Point Allowance System.
Note: Torres is considered by many to be an informal member of the Mask Trilogy because of its similarities to the other games, Tikal in particular.