Top 20 Mossmouth Games
Spelunky is an indie action-adventure game created by Derek Yu and released as freeware for Microsoft Windows and as a commercial game for Xbox 360 (two unofficial ports to Mac OS X also exist). The player controls a spelunker who explores a series of caves while collecting treasure, saving damsels, and dodging traps. The first public release was on December 21, 2008. The source code was released on December 25, 2009.