The shareware version contains the entire first episode of the game, Knee-Deep in the Dead. For every sale we receive a small fee from the download store which helps us to keep this free website alive. If you buy a game you don't only get the full version game, you also support DOS Games Archive. You can download the full version of DOOM from the download store listed below.
We recommend to use Google Chrome when playing DOS games online. You can play DOOM on this website so you don't need to download and install the game on your computer.