Overview HL²DM Pro is regular HL²MP from VALVe with additional features that make the game faster and more addictive and fun to play. The Tau Canon aka Gauss, longjump pack, bunny hopping, wall jump, brightskin models and hitsound are part of it for instance. The mod also features 13 gamemods (FFA, TDM, CTF, Fugitive, Arena, Instagib, ...).