Yoomurjak's Ring (Hungarian: Jumurdzsák gyűrűje) is an FMV (Full motion video-based) point-and-click adventure game by Private Moon Studios, designed by Hungarian game designer and musician Pierrot (Tamás Z. Marosi) in 2005. The original release of the game was in Hungary in October 2006. The English subtitled version was first released by digital download in April 2009 by Lezard Interactive. The game became available for iPhone and iPad in 2015. The game has a sequel titled MIAZMA or the Devil's Stone (MIAZMA avagy az ördög köve, released on DVD in Hungarian in 2015).