( RTSL page) It's a mostly puzzle and environmental-focused mod without guns. (And later the mod got hosted on Steam.)Īfter that is Research and Development.
The mapper was actually hired by Valve for his work on Minerva. ( RTSL page) That's the best one overall of all time, with great combat, storytelling, and level architecture, etc. If you want the absolute best, though, here's some quick links to a few of them. (IMO a small few of them are actually not very good, but w/e.) In general that's a good grab bag of the best maps made for the Half-Life games. Your best bet it to browse Run Think Shoot Live's Hall of Fame.