Every hero in Marvel Alliance 3: The Black Order has their own level and levels up independently. This means it is important you find characters that suit your play style before you start investing XP on them as you will not be able to transfer it once the XP has been allotted to a hero. This page will tell you how to level up heroes fast in Marvel Alliance 3: The Black Order, particularly the less experienced characters you may have on your roster.
XP Cubes
The quickest way to level up your less experienced characters is via XP cubes. You will find though that on the higher-level heroes XP cubes will have less of an impact. Check out our How to Gain Access to Secret XP Cubes to learn more about XP cubes.
Infinity Trials Mode
Another way to level up fast in Marvel Alliance 3: The Black Order is to play Infinity Trials mode, specifically any node that has the 'Wave' setting. When you beat the challenges in this mode you will earn a huge amount of XP for the characters you use. A good strategy when you want to increase the level of a specific hero that is low on XP is to group that character in a party with more experienced heroes. Doing this will enable them to gain a few levels during just one Wave challenge.
Check out our How to Unlock Characters to find out how to get every hero in the game.
We have questions and answers related to this topic which may also help you: