E1M1rmx with a twist: a certain amount of red keys scattered throughout the map have to be collected in order to proceed, making the gameplay largely non-linear.
Large Metal/gothic lava fortress with a bunch of modified and new monsters, as well as a medium sized, hard secret map. Very high monster count in both maps, compensated by slight changes to some weapons and ammo system.
Huge and very detailed space colony level with custom textures, new monsters such as Shock Troopers and Battle Mechs, as well as some other additional progs.