I played EPT (which incidentally predates the Early Pregnancy Test)
back in 1975 when it had just come out. I had a wonderful time as the
world is delightfully alien - much more so than the D+D hodgepodge of every
mythology and fairy story in existence. It also has a fairly reasonable
basis for blending technology (albeit often defective) with magic.
Unfortunately, the game system was very primitive and both combat and magic
were pretty awkward. The referee I played with just improvised his own,
and that worked quite well. I'd personally recommend using Dragonquest
rules, but as that's a defunct system it's probably not a great idea.
The new Swords and Glory books have immensely more detail about
Tekumel, and a completely new and apparently no more workable game system.
I haven't played it (been waiting for the third book to come out) but I
still heartily recommend the games as background material for a campaign.
I still remember being hunted by a pair of Serudla, and the horror of
realizing I had forgot to check the ceiling of a room as the mantle-like
Biridlu settled about the shoulders of my character...
Noah Falstein