A STALKER run from the Warehouses to Red Forest with nothing but Vodka and a pistol in my inventory, at night, on Master, with AMK mod on. That includes clothing, I wore the the starting jacket.
All weapons upon finding them have to be dropped and food can only be eaten where you find it, so either eat up or leave it.
Didn't help that I kept running into a freaking Electro-Chimera, can't even kill the fuckers when I'm fully loaded, let alone running off Vodka and a pistol.
Also Super Meat Boy with constant running, my hand was permanently on shift and you're not allowed to stop moving (unless of course you're waiting for a platform).
Both are working progresses as they are not easy feats, by that I of course mean I am failing miserably and I don't know why I set myself them.