Halo Online was a free-to-play first-person shooter developed by 343 Industries and Saber Interactive, and published by Microsoft Studios and Russian publisher Innova Systems. The game is based on a heavily modified version of Halo 3 (Blam! Engine), optimized to be run on lower-end PCs. A closed beta for the game took place in Russia in spring 2015, but the game was later cancelled with no plans to launch it in other countries. Later, a fan-made mod called ElDewrito revived the game and allowed it to be played worldwide. It gained increased popularity upon the release of Version 0.6, which included many added features that increased its stability and accessibility.