Should take you about 15 minutes
HAND - a silly set of replacement weapons that I played for 5 minutes and was still laughing half an hour later.
Two remakes of Doom's E3M1 are floating around Doomworld's forums:
- spd-e3m1 is a remix more than a remake, you can tell it's E3M1 but it changes a little bit towards the end. Very good.
- mdkeep is much more similar to the original.
I preferred the first one, the second was a bit too similar to the original.