Commander Keen is an episodic video game developed by id Software in the early 1990s. The series focuses on the adventures of Billy Blaze, an 8-year-old boy who travels through space and assumes the secret identity of "Commander Keen". The series was successful at replicating the side-scrolling action of the Nintendo Entertainment System Super Mario Bros. games in DOS. The cartoon-style platform games are notable for their pioneering use of EGA graphics and sharewaredistribution, and they were some of the first games by id Software (who went on to later develop Wolfenstein 3D, Doom and Quake). The games were also exciting to thePC gaming community of the time because of John D. Carmack's smooth-scrolling graphics game engine, which first allowed smooth side-scrollers on PC by only redrawing the screen's elements that changed frame-to-frame.[1] Most of the Commander Keen games were published by Apogee Software, an already established DOS shareware game publisher. Tom Hall is Commander Keen's designer and the creator of its universe. Commander Keen Complete Pack, a collection of the officialCommander Keen games (excluding Aliens Ate My Baby Sitter and Keen Dreams) was made available on Steam on August 3, 2007. Keen Dreams was ported and released for Android enabled devices on June 10, 2013 on Google Play.

Contra (魂斗羅 コントラ Kontora?), distributed as Gryzor in Europe and Oceania, is a 1987 run and gun action game developed and published by Konami originally released as a coin-operated arcade game on February 20, 1987.[3] A home version was released for the Nintendo Entertainment System in 1988, along with ports for various computer formats, including the MSX2. The home versions were localized in the PAL region as Gryzor on the various computer formats and as Probotector on the NES, released later. Several Contra sequels were produced following the original game.

Contra: Hard Corps is a side-scrolling run and gun-style shoot-'em-up video game released by Konami for the Sega Genesis in North America and South Korea in 1994. It was also released for the Mega Drive as Contra: The Hard Corps (魂斗羅 ザ・ハードコア Kontora Za Hādo Koa?) in Japan and as Probotector in Europe and Australia . It was the first game in the Contra series released for a Sega platform and serves as a departure from preceding games in the series in many ways. Set five years after the events of Contra III: The Alien Wars, a terrorist group led by the renegade Colonel Bahamut have stolen an alien cell recovered from the war and now intends to use it to produce weapons. Instead of the traditional Contra heroes of Bill Rizer and Lance Bean, a new task force known as the Hard Corps (with four members) are sent to deal with the situation. The game features a branching storyline with multiple possible endings.

Step into the world of Crossy Temple. Play as an explorer, like Indiana Jones, and make your way through the ancient temple full of precious gold coins and booby trap at every turn. If you're not careful enough, you might get impaled by spears, fall into lavas, or get run over by giant stone discs. How far can you get? Test your skill today.

Dandy Cave Explorer is a sequel to Dandy Cave Adventures, with new and improved gameplay, 40 challenging levels and retro themed. Can you collect all of the treasure?Simply click to jump at the correct timing.

Dangerous Dave is a 1988 computer game by John Romero. It was developed for the Apple II and DOS as an example game to accompany his article about his GraBASIC, an Applesoft BASIC add-on, for the UpTime disk magazine.