The player makes their way across six levels, throughout which they encounter enemies such as Zombies, Headcrabs, and the Combine. Gordon is armed with various weapons, including the trademark crowbar and the Gravity Gun introduced in Half-Life 2. The side-scroller shooter game offers the player the ability to control Gordon by using the keyboard for movement, and the mouse for aiming and firing weapons. However, unlike the other games in the Half-Life series, Codename: Gordon is set in a two-dimensional world. Just as in Half-Life 2 the player takes control of Gordon Freeman. The game includes a high-score system with network support and numerous secrets.Дue to the game's development and release before Half-Life 2, several pieces of content from the E3 2003 Demos and 2003 Half-Life 2 Beta era are present, such as the design of the buggy, and the docks having an extremely similar look to the traptown demo, specifically because of the presence of combine soldiers. The game can be installed by going to steam://install/92. Because access to the site is hardcoded into the game, Valve was forced to remove it from their site catalog. Valve had released Codename: Gordon via Steam, but the game was removed due to its developer's default, because of this, their official site had been replaced with an ad site.

The game engine was created in Adobe Flash, and the graphics were created in Photoshop Developed parallel to their work on PsychoToxic, Codename: Gordon features 6 chapters, 8 different enemies, 5 weapons as well as a fully functional buggy. The game takes place through dozens of levels inspired by Half-Life and Half-Life 2, challenges players to a slew of puzzles, and showcases many of the familiar creatures in an all-new, two-dimensional playing field.

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