this is an interesing question ... and the answer is yes/no - it can work alone, however you'll need to develop a complete pak set for it to work from because it likes something standard there.
failing this you can use the demo versions of Half-Life, Quake (updated to 1.06), Quake2 (updated to 3.20), Quake3 and others...

i oftenly use the demo's for development because Quake2 and Quake3 are around 600Mb full installation, whereas the demo's are 40 - hehee on a laptop its good to keep them as small as possible.
Fileplanet and
idsoftware.com both keep these demos in stock ... and are on barely used servers now
Tsu'va Oni Ni Jyuuko Fiori Sei Tau!
One block follows the suit ... the whole suit of blocks is the path ... what have you found?