WADs in Doom 2, BOOM
Time Of Maps - Part 1
TOM is a boom compatible wad that uses only doom2 format line actions (except some boom light transfers) and sector effects. -complevel 9 in PrBoom-Plus is required for some rising stairs and "floor lower to 8 above highest floor" behaviour. Some maps don't work properly in ZDoom.
Okay, for starters: THIS LEVEL IS LARGE. VERY, VERY, VERY LARGE. It has ~2400 sectors and ~2300 monsters on UV. I would NOT recommend playing this level if you have a really old computer. Second, this map is pretty hard. 100% kills and secrets on skill 4 is possible, but difficult (I've done it with a lot of saving and reloading). Other than that, it's fun with a lot of action. So enjoy it!