Mechanics refer to additional game mechanics that were added to the normal rules, usually only featured in one set, and that add complexity and new rules to the game.
- Madness (The Obligatory Cthulhu Set)
- +1 power counters (Monster Smash)
- Monsters (Smash Up: Munchkin)
- Treasures (Smash Up: Munchkin)
- Titans (Big in Japan)