Patch 15d was the fourth minor revision following the major Patch 15, which introduced:
Visual glitches like 7-S ponds not staining correctly and Mannequins remaining parryable after landing on Brutal difficulty were resolved. Top Gameplay Features in the 15d Era
The newly added Speedometer received dedicated options for horizontal-only or vertical-only tracking, and its opacity was fixed for the Classic HUD. ultrakill v15d top
Explosions that do not kill now grant increased style points, while projectile boost points were reduced from 150 to 90 to encourage more varied gameplay.
Patch 15d is often cited as a "stable" version for players who prefer to downpatch for mod compatibility. Later major updates, such as the "ULTRA_REVAMP," significantly changed the game’s underlying code, leading many in the community to stay on the Patch 15 branch to maintain access to specific fan-made mods until they are updated for newer versions. Patch 15d was the fourth minor revision following
Malicious Faces were corrected to properly take impact damage from explosions when made vulnerable with gasoline.
Fixed a bug where the SRS Cannon would fire "absurd amounts" of simultaneous cannonballs when paired with a Dual Wield powerup. Patch 15d is often cited as a "stable"
For players aiming for the "Top" rank (P-Rank), Patch 15d refined the tools necessary for mastery: