Tetris Plus is a puzzle video game developed by Natsume and published by Jaleco for the Sega Saturn, released in 1996. It's an enhancement of the original Tetris game and includes a new Puzzle Mode, where a professor and his assistant are exploring ancient ruins. Players must solve tetris puzzles to advance through levels and assist the duo. The game retains the classic Tetris gameplay but adds new features and levels, making it a refreshing take on a beloved genre.