I decided to try my combat loadout (e.g., maintaining max damage between levels, Float facemark etc.) with all the Flint fights that didn't have a dedicated level like the mech boss. Since these don't have proper levels this was purely for fun lol.

I added the Endless Dive Flint just because it was unique enough from the other Flints in earlier floors (also weird name).

Unless you want to replay Lost Riviera and District 5, the first two Flint encounters can only be played independently via UnityExplorer. The third starts as soon as you start Utopia Shelter and the Endless Dive one requires editing your save unless you want to go all the way to floor -102 lol.

Timestamps for each:
00:00 - First Encounter
00:20 - Second Encounter
00:40 - Final Encounter
01:01 - Endless Dive Flint