Day 24, 12:00, for 12 hours: 23 zombies at ×6 health and ×4 attack.
Part of Endless tier 5, day 4 of 5.
When it ends: 
All-Purpose Strengthener
Fine Sheet Metal
Beef Noodles (Endless rewards, tiers 5-7)
Day 24, 12:00, for 12 hours: 23 zombies at ×6 health and ×4 attack.
Part of Endless tier 5, day 4 of 5.
When it ends: All-Purpose StrengthenerFine Sheet MetalBeef Noodles (Endless rewards, tiers 5-7)