Playable beta versions of Unreal. Not all of them have levels, some have only test maps or don't have any maps.
See
FAQ if you have problems.
Links Description Contents 1995 Download TCRF Oldest known prototype (september 1995). One map and monsters Download Download First version (and the only 95 version) with UnrealEd. November 1995. One map Information Download (4 map version) Download (5 map version) TCRF TechDemo (december 1995) 4 or 5 maps, no monsters 1996 Download (with installer) Download (no installer) Download (4 map version) TCRF 0.83 (1996) One testmap or four maps: BatSet, Seti, Siobhan, Unreal (test map) Download (with installer) Download (no installer) 0.84 (1996) One testmap 1997 Download Download TCRF 0.86 (1997) Two testmaps Download 0.864v (1997) One testmap Download 0.866q (1997) No maps Download TCRF 0.867z (1997) One testmap Download 0.868z (1997) One testmap (the monster isn't from Unreal) Download 0.871d (1997) Maps: Aztec, FortressEntrance, Moros, Ruins Download 0.874d (1997) Maps: Aztec, FortressEntrance, Moros, Ruins, ArizaX, Break, SkyDM7, TundraX, Unreal (test map) Download (with installer) Download (no installer) 0.88 (1997) One testmap 1998 Information Download Map fix Masterkent's patch 99 (1998) Almost all maps
There's also a build known as Unreal.098.1997.11.03, but it's
confirmed to be fake.