Asymmetry: (Every player is different) The game requires more than one player, but each player has entirely different goals and rules.

Good Vibrations: (Game contains haptic feedback) Make a game where haptic feedback (e.g. rumble or force-feedback) is a key ingredient.

Followers: (Increasing number of NPCs follow you) The game involves a growing number of autonomous non-player characters that are always following the player character’s position.

I know what you did last…: (Game changes between sessions) The game mechanics or content will change in the next play session, based on the actions taken in the previous session.

Asymmetry: (Every player is different) The game requires more than one player, but each player has entirely different goals and rules.

Collaborative Casual/Hardcore: (Two players: one casual, one hardcore) Collaborative play for two, but one player has more to do than the other (or the difficulty level is different between them).