Cataclysm mode

The 1.0 post is the rule I use for the mode you can select now. Cataclysm unlocks after Standard. A horde night lands every 5 days. Cataclysm enemies show up every 7 days. You respawn where you fell. There are leaderboards. Patch 1.0.4 added Cataclysm to the room-list filter next to Standard and Horde.

On 16 Oct 2026 a preview described something else: hold a line against timed waves, or hunt random cataclysm events, and if a six-metre Zombie King survives the countdown the world's cataclysm level rises and zombies mutate. I am not folding that preview into the 5-day and 7-day timers. It might have been retuned, and the launch post does not say the King is still the meter.

Wave lists, mutation names, and the King's health are not published in either text. The flamethrower night in the screenshot is the mood of the mode, not a documented wave composition.