If you're referring to the WR times, on Patch 15b there was a bug with the Firestarter (red rocket launcher variant) that allowed you to create a layer of oil and then shoot it with the Malicious Railcannon to create a series of explosions. these explosions would kill the Leviathan basically as soon as it spawned. In the hotfix after, Patch 15c, it was removed from the game and is no longer possible unless you downpatch.
Although downpatching to run 5-4 of all levels is just boring -w-
I... think I got that all right (if not feel free to correct me qwq)
Edit: should be accurate now?
Oil explosions were added in 15b and nerfed in 15c. In 15a you could use firestarter to have fire underwater.
its run on 15b
on this patch, every oil voxel would explode and deal its damage too and thus big boom and big damage. now, enemies can only take dmg from 1 oil voxel explosion chain (i think its this, either this or a cooldown, theres basically no difference tho)
If you have not seen ULTRAKILL is finally having a speedrunner competition for real money!!! It starts in about four hours from the time I am making this news post, in fact its probably already started when you are reading this so click the challenges widget on the right and read up on the rules and