LETHAL

"Let's kick some tail". I don't get why the other reviewers get their panties in knot, this is pure, unadulterated 1994 fun...even though the map is actually fom 1997. Early 1997, so let's cut it some slack, m'kay? As the zombiemen say when they die "you fuckin' chill" (?).

OK, the new sound effects sound like something I'd have done back in 1994, with the newly discovered joys of "multimedia" and such, but they sure got a chuckle out of me, and that's enough to get two stars.

Map design...well, TBQH only MAP01 and a few others like MAP11 (the one in the "KEEP" screenshot) and MAP13 (the one with the black boxes/keens) seem to be somewhat decently designed for single player, and even those are way too easy. A pistol start is a must if you want to have something remotely close to a challenge.

It also shows the map designers weren't actually incompetent, even though the progression/traps are very predictable. Most of the maps consist of boxy rooms/plain open arenas with few variations, even though there are some nice touches and ideas here and there, but they obviously couldn't keep it up for 21 maps.

What makes the gameplay tedious however is a certain proclivity by part of the authors to avoid the use of switches, while the maps are designed around a "hump random wall X to open new section Y, monsters pour in, rinse, repeat" formula so get used to A LOT of wall humping unmarked walls and random textures, backtracking and "where the fuck do I go now?" moments if you want to max most maps.

TBQH I don't get how any of those maps would be good for multiplayer and particularly Deathmatch, as they are waaaay too large.

"Deathmatch" 

Avoid playing this, it's really not that good.