Monster Mayhem - Build And Battle (US)(Suxxors) ROM Download can be obtained free for Nintendo DS on EmuGames.net only. Play emulator game in English for the USA region. Monster Mayhem Build And Battle is a NDS ROM that you can download to your computer or play online within your browser. You can also download roms such as Monster Hunter Freedom and Monster Hunter Portable that work on all devices including desktop and mobile. Be sure to rate the game if you enjoyed playing this ROM.