These games have situations where you try to guess correctly and/or make your opponent guess incorrectly. In Unknown Teams games, opponents don't know your player color, your goal, and/or your team membership, but this information is fixed throughout the game. In Bluffing / Outguessing games, the unknown information usually changes throughout the game, or is based on other factors such as which of your opponent's pawns are dangerous.
You may also be interested in games in the Unknown Teams / Goals / Ownership genre.
