MIT's Game Design course (CMS.608, Fall 2010) devotes this session to puzzles as a game form, taught by Philip B. Tan and Jason Begy. The lecture defines puzzles by their strict rule systems and typically singular solutions, distinguishing them from other game types, and looks at how puzzles appear as standalone challenges or embedded within larger narrative games, such as a lock-and-key mechanism standing in for a real-world action. The discussion draws on Scott Kim's writing on what makes something a puzzle and references a chapter from Brathwaite and Schreiber's Challenges for Game Designers. Expect analysis of puzzle structure, solvability, and design purpose rather than a survey of specific puzzle games. The session fits into the course's broader examination of game mechanics and genres, aimed at students designing their own games.