Achievements
"Ultra Hardcore" has been renamed to "Hardcore", to make way for a harder achievement...
Ultra Hardcore
Reach wave 75 with the "Disable Health Regen" modifier active, and "Base Health" modifier set to 2 or less.

Rapid Descent
Reach the 25th floor of the Backrooms in under 15 minutes.

In other news...
- New Nuke VFX on Zombies
- New Fire Barrel VFX
- The glow sprite around power-ups now shrinks, and scales down over 10 seconds instead of 5.
- Some optimisation on Zombie Pathing, should increase performance a little.
- Fixed both weapons not firing when out of ammo during bottomless clip
v3.5.3 Changes
- Mystery Box now only spawns in the basement at start.
- The Wall Buy has been moved in the coffin room to a different wall.
- The Mystery Box in the coffin room now spawns where the Wall Buy used to be.
- If you clip into an area that isn't yet unlocked, you will be teleported back to spawn.
v3.5.4 Changes
- Zombies will be less likely to spawn at spawn points extremely far away. This includes The Backrooms.
- The Mystery Box on The Backrooms is no longer guaranteed, and it's chance to spawn is tied to how complex the layout is. The higher the complexity the higher the chance.
- The Mystery Box on The Backrooms has less uses until it teleports away compared to normal maps.
- Ultra Hardcore Achievement has been changed to: Reach wave 75 with the "Disable Health Regen" modifier active, and "Base Health" modifier set to 2 or less.
