Reality is a style of Doom play invented by Benjamin "Cowboy" Lauterbach. In a Reality demo the player is not allowed to take damage (since being shot in real life would kill you), and not allowed to use the plasma rifle or BFG (since these weapons do not exist). Because of these restrictions, it is impossible to complete a level Reality style if taking damage is unavoidable. Also, levels with high numbers of hitscan enemies become very difficult.
The first Reality demos were collected by Thomas, who ran a website collecting Doom II speedruns in this style. On harder levels he accepted demos on difficulty levels other than UV. Since then Reality demos have been submitted to DSDA, but it has not become a standard competition category at Compet-n.
- Doom2 Reality Collection (retrieved from archive.org)