Chubzdoomer | (Doom Builder) How to Merge Levels (Make Megawads!) @Chubzdoomer | Uploaded October 2019 | Updated October 2024, 15 hours ago.
Ever wanted to make a WAD consisting of two or more levels? In this video I show you to do just that!

BONUS TIP:
If you would also like to name your maps, you'll need to open your WAD with an editor like SLADE and make a brand new MAPINFO entry (be sure to move it above the pre-existing map files!).

MAPINFO lets you name your maps, set their music, and much, much more. Since there's so much to it, I decided not to cover it in this video. I may very well dedicate a tutorial to it in the future.

For now, feel free to use this MAPINFO example as a point of reference:
_______________________________________________________
map MAP01 "Map Name Here"
{
next = "MAP02"
secretnext = "MAP02"
sky1 = "SKY1"
cluster = 5
par = 30
music = "$MUSIC_RUNNIN"
}

map MAP02 "Map Name Here"
{
next = "MAP03"
secretnext = "MAP03"
sky1 = "SKY1"
cluster = 5
par = 90
music = "$MUSIC_STALKS"
}
_______________________________________________________

If you'd like to learn more about MAPINFO, I suggest checking out these pages:
zdoom.org/wiki/MAPINFO
zdoom.org/wiki/MAPINFO/Map_definition
doom.fandom.com/wiki/MAPINFO

Additionally, here are MAPINFO files for vanilla DOOM and DOOM 2:
github.com/rheit/zdoom/blob/master/wadsrc/static/mapinfo/doom1.txt
github.com/rheit/zdoom/blob/master/wadsrc/static/mapinfo/doom2.txt