Free Online play over World Opponent Network 2 (WON2).
Game is running on Half-Life/Counter-Strike version 188.8.131.52 (newest)
Also installed are HLDM (Half-Life DeathMatch 1.6) and TFC (Team Fortress Classic 1.6)
It does not support widescreen res, run it on OPENGL for best results.
It includes a couple of custom maps and sounds to save some downloading time.
Credits to most of this go to www.steamlessproject.nl and others for creating WON2 and the Half-life patches.
System Requirements for this are the Retail systemrequirements, not the steam ones :).