Bhop was patched in 2010 with the orange box update ABH is the remaining method. Firstly, you need a way to jump super quickly, you can do this with an AHK script [wiki.sourceruns.org] or you can use some custom binds by typing "bind mhwheelup +jump;

Half-Life 2 Done With a High Magnitude of Velocity is a segmented world record speed run for (new engine) HL2, which uses this technique almost constantly. Skip to 41:40 for an instant insight into the possibilities.

In games with relatively high air acceleration like Half-Life 2, the more precise your S-taps are. the more speed you'll preserve since the longer you hold S the more you decelerate yourself while in the air. On the other hand on games like Portal wit