Yesterday Bio Menace, the classic side-scrolling platfrom game from Apogee Software, turned 25. To celebrate, 3D Realms released a beta version of the game, under the title Bio Hazard, as a free download. The beta, coming from 3D Realms archives, was restored to working condition by Hendricks266 and NY00123. Download it here.
Bio Menace has been freeware since December 2005, you can download the full version from the official game page.