Day 120, 12:00, for 24 hours: 526 zombies at ×25 health and ×28 attack.
Part of Endless tier 24, day 5 of 5.
When it ends:
All-Purpose Strengthener
Fine Sheet Metal×2
Tempered Glass
Electronic Components×2
Scrap Metal×6
Broken Glass×6
Cold Cuts
Mystery Novel (Endless rewards, tiers 20-29)