Imp Atak (2004 edition):
- added: full doom2.exe (1.9) compatibility
- added: two new Imp types, Lesser Imp & Dark Imp
- removed: Ghost Imps
- removed: the chainsaw
- changed: disabled the fist
- changed: BFG cell usage back to normal (40)
- changed: Warehouse doors are now locked and require a key
- changed: new (better looking) start room

- a huge amount of small tweaks & fixes

Imp Atak (2001 edition):
- added: Imp bodies disappear after a while
- added: ZDoom obituary messages
- changed: Ghost Imps are more rare

Imp Atak (1999 edition):
- the original release