My flagship mod for Half-Life where you can never beat my speedrun record of 15.383 seconds. Just can't be done. Features a grand total of one level, with a bonus fidget spinner level for your troubles.
Youtube.com
On June 27, 2017, speedrunning history was made when the Bryce Mod was completed in 00:26.954, a NEVER BEFORE seen time for the mod (for the time). However, this run has been beaten as of December 25, 2019.