A (not very good) mod that looks into a bizarre (is that a jojo reference) new timeline for Black Mesa. Warning: This mod contains content that may not be suitable for everybody. Viewer discretion is advised.
A simple map based off the infamous "minus world" glitch from the Mario series. Has an island with 3 steps on the end where you start. On the other end there is an invisible teleport that brings you right back to the start. Required sounds and WAD file included.
To clarify, this map does work with the original Half-Life, the file is just linked to the mod.