The juicy part of Raid Mode. Missions are that, missions in which you have to complete certain objective in order to complete it. You examine the RED DOOR to access the Mission Menu while examining the BLUE DOOR allows you to play the missions with a friend or a random player.
You gain Gold and XP at the end of each mission and extra Gold and XP if you finish 100% the mission but you also need to pay a certain amount of Gold to be deployed in the mission. Each mission also has a recommended level but of course you can use any level you desire, BUT to get the Completion Medallion you’ll have to use the Recommended Level or lower.
The Gauntlets on the other hand is the group of missions. For example, Gauntlet I refers to the 6 missions grouped together. The colored “band” on the Gauntlet lets you know how many missions you’ve completed in that certain Gauntlet. Here’s a little list of them.
Another good thing is that the game itself tells you how to unlock each Gauntlet so you won’t have to search all over the internet (or in this guide) for how to unlock them. Most of them consist on obtaining a certain amount of Medallions.
As you can see from the picture above, the screen before being deployed tells you all you need to know.