Mossmouth, LLC. (2008). Spelunky [Video game]. https://spelunkyworld.com/

Spelunky is a 2D platform game developed by Derek Yu and released as freeware for Microsoft Windows in 2008. The game combines traditional platforming with roguelike elements, offering procedurally generated levels that ensure each playthrough is unique. Players control a spelunker navigating through a series of caves, collecting treasure, rescuing damsels, combating enemies, and avoiding traps. The primary objective is to gather as much treasure as possible while surviving the perils of the underground.

The gameplay is characterized by its high difficulty and permadeath feature; when the player character dies, the game restarts from the beginning, with a newly generated set of levels. This design encourages players to develop skill and strategy, learning from each attempt to progress further. The spelunker is equipped with a whip for attacking enemies, and a limited supply of bombs and ropes to navigate complex terrain. Various items can be collected to aid in the journey, and shops within the caves offer additional equipment for purchase.

Spelunky's development drew inspiration from classic games like Spelunker (1983) and La-Mulana (2005), aiming to blend the challenging aspects of roguelikes with real-time platforming. The game's source code was released in 2009, fostering a community of modders who created various modifications and expansions.

An enhanced version of Spelunky was released for Xbox Live Arcade in 2012, featuring updated graphics, new music, and additional content. This version was later ported to platforms including PlayStation 3, PlayStation 4, PlayStation Vita, and Nintendo Switch. The game's critical acclaim is attributed to its tight controls, depth of gameplay, and the replayability offered by its procedural generation and challenging design. Spelunky has been influential in the development of the roguelike genre, inspiring numerous games that incorporate similar mechanics. A sequel, Spelunky 2, was released in 2020, building upon the original's foundation with new features and expanded content.