Happy Birthday Demo (2001) (Dennis Debro) (PD) ROM Download can be obtained free for Atari 2600 on EmuGames.net only. Play emulator game in English for the USA region. Happy Birthday Demo is a Atari 2600 ROM that you can download to your computer or play online within your browser. You can also download roms such as Batman Happy and Slap Happy Rhythm Busters that work on all devices including desktop and mobile. Be sure to rate the game if you enjoyed playing this ROM.