Verlet Swing 「Hardcore Marathon in
Here's the other challenge, arguably the more stressful one to an untrained endurance person, or someone who doesn't play first person games like me heh. Extremely brutal for how short it is.
Time: 39.4h (steam hours, counts all previous hours counting to Marathon sub15 minute speedrun)
Steam 100% time: Not yet, will update once done. Just miscellaneous achievements left.