Green Run, Nuketown Zombies, Die Rise, and Mob of the Dead are the Map Names- In the case of NZ, DR, and MotD Treyarch has always referred to these three as maps and never as gamemodes or anything else. In the case of GR, TranZit was always referred to as a gamemode, so Green Run had to be the name.

In addition to being able to earn money, becoming a game tester can be a rewarding experience. As a game tester, you'll typically gain access to the latest games, which means you'll have an insider's view of the gaming industry.

The role of a tester can often be stressful and require persistence and patience. That said, the rewards that come with helping a game become ready for market are well worth the effort.