Popular games built on game engine ZDoom

Grezzo 2is a first-person shooter video game developed by Italian game designer Nicola Piro and released in 2012. The game is a total conversion modification of the 1993 video game Doom and its development began in the early 2000s, with the version called Grezzo 1, when Nicola Piro attended high school. The plot follows the adventure of pagan farmer Piro which, annoyed and disgusted by Christianity, plans to kill Jesus Christ to prevent the rise of his religious phenomenon. Gameplay requires the player to face various levels, defeating enemies and bosses and using a wide range of weapons. Many well-known personalities of the culture of Italy appear in the game, as well as references to extremely satirized social, political and religious issues of the country. Following the 2012 release, Grezzo 2 received significant attention, both inside and outside of its country of origin, due to its extremely blasphemous, vulgar and violent content.

The Adventures of Square is a standalone first-person shooter using the ZDoom Engine, featuring real, retro first-person-shooter gameplay, in the vein of older shooters like Doom. The brilliant Doctor Octagon has been kidnapped! Square must find him, and rescue him from the clutches of the Circle of Evil, a mysterious cult hellbent on the domination of Shape Land. He will square off against terrible monsters and impossible traps in order to prove that he's no square when it comes to justice. Guide him to the center of the Circles' domain, unravel their malicious plot, and win the day fair and square! Save anywhere and at anytime! Food is health! No ragdoll physics! It has it all!

Chex Quest 3 is the newest edition to Chex Quest, a series of comedic sci-fi shooter games. It contains slightly updated versions of the maps from Chex Quest and Chex Quest 2, in addition to new maps.