Play Maniac Mansion game online in your browser free of charge on Arcade Spot. Maniac Mansion is a high quality game that works in all major modern web browsers. This online game is part of the Adventure, Arcade, Emulator, and NES gaming categories. If you enjoy this game then also play games Animaniacs and Moto Maniac 3. Arcade Spot brings you the best games without downloading and a fun gaming experience on your computers, mobile phones, and tablets. New arcade games and the most popular free online games are added every day to the site.