In Challenge tab, you can choose to play Legendary Battle, World Boss, Shadowland and Dimension Rift.
Legendary Battle[]
In Legendary Battle, you can recreate memorable scenes inspired by the Marvel Cinematic Universe and get bonus rewards by clearing stages.
World Boss[]
World Boss are the End Game content of MFF. You need at least 1-3 6* heroes to participate in them. They are hard in the beginning, but with the right combination of heroes and team soon you'll be a pro at finishing them. It is advisable to use high level geared heroes with good ISO-8 sets and team to have a better chance at World Boss.
Shadowland[]
In Shadowland, fight your way to the top and collect various rewards.
Dimension Rift[]
In Dimension Rift, clear it on higher difficulties to get awesome rewards.