Operation Mecha Engine
Operation Mecha Engine is an Advanced Mann vs. Machine operation featuring three missions on two maps. It was introduced in the Mecha Update, together with the Engineer Robot and Bigrock. Upon the completion of the first mission, the Operation Mecha Engine Badge is awarded.
Contents
Missions
| Operation Mecha Engine missions | |||
|---|---|---|---|
| Map | Missions | Waves | Notable Robots |
|
Disintegration (Advanced) |
6 |  Major Bomber |
| Decoy | |||
|
Broken Parts (Advanced) |
7 |  Sergeant Crits |
| Bone Shaker (Advanced) |
8 |  Captain Punch | |
| Bigrock | |||
Available loot
Completing one of the missions in this operation in a Tour of Duty rewards the player with a random item from the random drop pool. Upon completion of the whole operation, the player receives the regular loot upon completion of a mission, but is also guaranteed to receive a Silver Mk.II Botkiller weapon or a rare Gold Mk.II Botkiller weapon. There is a small chance the player also receives an Australium weapon (for a total of up to 2 loot items).
| Operation Mecha Engine loot | ||||||
|---|---|---|---|---|---|---|
| Upon mission completion |
Guaranteed loot | 
|
| |||
| Item from the random drop pool | Operation Mecha Engine Badge† | |||||
| Upon tour completion |
Guaranteed loot |  
| ||||
| Silver Botkiller MK.II weapons‡ | ||||||
| Rare loot |  
|
|
| |||
| Gold Botkiller Mk.II weapons‡ | Australium weapons | |||||
| Note | † Only upon completion of the first mission of the first tour, or upon completion of the first mission of the first tour after deleting the item. Deleting the item resets the tour count. | |||||
| ‡Only one Botkiller type and weapon is awarded per completion. | ||||||
Strategy
Main article: Community Mann vs. Machine strategy
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