UDMF (or unabbreviated to Universal Doom Map Format) is a specification for laying out maps in a textual way, it is essentially a new map format for Doom engine based games. The format is not backwards-compatible with older Doom engine games. UDMF version 1.0 was finalized on May 29th, 2008. Support for it is currently implemented in GZDoom, Vavoom, ZDoom, Skulltag, ZDBSP, Doom Builder 2 and SLADE 3. It is also expected to be supported in Eternity.