Team Fortress 2
There is a special type of MvM known as "Mann Up" mode. In Mann Up mode, players complete "Tours" using "Tour of Duty Tickets" or "Squad Surplus Vouchers" they have bought from the online store, known as the Mann Co. Store. Each "Operation" has a specific number of Tours in them. Finish all the waves in a Tour and all the Tours to complete the Operation. Different Tours are for different skill levels and have different robots. Completing Tours and Operations will give the players "loot" or special in-game cosmetic items players use to customize their character. In Mann Up mode, the gameplay (upgrades, maps, robots) are the same in standard MvM.