When it hits
Day 49 on the Student's run
Part of 
Zombie Horde, starts with Zombie Horde Returns.
The same wave on the other runs: Wage Slave, Warehouse Manager
Who comes, and where
25 zombies: 15 door · 10 window.
Every zombie in it has ×1.94 HP, bites ×8 as hard, bites ×1.1 as often, on top of the horde setting.
At the door 15
| Zombie | How many | At once | HP each | Bite |
|---|---|---|---|---|
| Office Worker Zombie | 4 | 2 | 252 | 8 |
| Crawler Zombie | 2 | 1 | 194 | 8 |
| Nurse Zombie | 2 | 1 | 213 | 8 |
| Neighbor Zombie | 2 | 1 | 175 | 8 |
| Barefoot Zombie | 2 | 1 | 155 | 8 |
| Hulk Zombie | 1 | 1 | 970 | 64 |
| Soldier Zombie | 1 | 1 | 427 | 32 |
| Worker Zombie | 1 | 1 | 388 | 16 |
At the window 10
| Zombie | How many | At once | HP each | Bite |
|---|---|---|---|---|
| Office Worker Zombie | 3 | 1 | 252 | 8 |
| Nurse Zombie | 2 | 1 | 213 | 8 |
| Barefoot Zombie | 2 | 1 | 155 | 8 |
| Worker Zombie | 1 | 1 | 388 | 16 |
| Crawler Zombie | 1 | 1 | 194 | 8 |
| Neighbor Zombie | 1 | 1 | 175 | 8 |
What beating it pays
A wave's total HP sets its reward tier. Each tier pays its reward, and the zombies you kill leave loot on the ground.
| Zombie Horde Intensity | Total HP | Reward |
|---|---|---|
| Weak | 4,906 | Tier 2 |
| Standarddefault | 6,531 | Tier 3 |
| Strong | 8,165 | Tier 3 |
| Very Strong | 9,792 | Tier 3 |
The game also adjusts each wave to how ready your home is (doors, defenses, supplies and how the last wave went), so the HP here is the starting point.
From the game files2
TowerWave 2009
| ID | 2009 |
|---|---|
| EventID | 52682 |
| OwnerCrisisID | 135 |
| ZombieTypeList | [9108,9104,9102,9109,9103,9106,9101,9107] |
| ZombieCountList | [1,1,1,2,4,2,2,2] |
| MaxAliveCount | [1,1,1,1,2,1,1,1] |
| ChargeThreshold | 0.2 |
| TargetSlotTypes | [8] |
| AttackMultiplier | 8 |
| HpMultiplier | 1.94 |
| AttackSpeedMultiplier | 1.1 |
| SpawnAnchor | ZombieSpawn_01 |
| SpawnInterval | 2 |
TowerWave 2010
| ID | 2010 |
|---|---|
| EventID | 52682 |
| OwnerCrisisID | 135 |
| ZombieTypeList | [9102,9109,9103,9106,9101,9107] |
| ZombieCountList | [1,1,3,2,1,2] |
| MaxAliveCount | [1,1,1,1,1,1] |
| ChargeThreshold | 0.2 |
| TargetSlotTypes | [9] |
| AttackMultiplier | 8 |
| HpMultiplier | 1.94 |
| AttackSpeedMultiplier | 1.1 |
| SpawnAnchor | ZombieSpawn_02 |
| SpawnInterval | 2 |