Dixmiggie 3, as Trogtor has stated, is a sequal to Dix Miggie and Dix Miggie 2 created by user Jayce/Leidoffon. There has been a Dix Miggie for RPG Maker, Doom and Blockland. Only Blockland has had up to three Dix Miggies, where RPG Maker has had 2. I can't recall if the Doom Wad got up to 2 Dix Miggies, but it definitely has had at least one.
These games usually consist of being silly adventures with silly characters. The Doom Wads and Blockland variants had you as the main character, where the RPG maker variants had you play as a specific set of characters (In Dix Miggie 2, the main Protagonist was Will Smith, and one of the party members he could get was Weird Al and Michael Jackson.)
The levels usually have a horror level (Unsure of the exact reason) and a sewer level, as a running joke of Jayce constantly putting sewers into most of his projects.