Level

A level is any given area where a game takes place. Doom and Heretic use an ExMx format for maps, and Doom II, Hexen and Strife use a MapXX format. The latter two of these use a hub system. ZDoom can use any 8 character string as a level name by modifying the MAPINFO lump, and it also allows for the use of hubs.

Each map contains several lumps:

• Map header (gives the map its name, contains no data except possibly FraggleScript)
• TEXTMAP (UDMF-only)
• THINGS (not in UDMF)
• LINEDEFS (not in UDMF)
• SIDEDEFS (not in UDMF)
• VERTEXES (not in UDMF)
• SEGS
• SSECTORS
• NODES (binary formats) or ZNODES (UDMF)
• SECTORS (not in UDMF)
• REJECT
• BLOCKMAP
• BEHAVIOR (not in Doom format, optional in UDMF)
• SCRIPTS (optional source code of BEHAVIOR)
• ENDMAP (UDMF-only)