The Campaign is the main story mode of Disney Heroes. It allows you to explore The City and The Hub in three different campaign modes: Normal, Elite, and Friends.
Normal Campaign[]
The Normal Campaign is your main progression. Here you'll follow the game's story while earning Badges to promote your Heroes. Three-star campaign levels to enable raiding. Raiding allows you to earn badges quickly.
For more infomation, see Chapters.
Elite Campaign[]
The Elite Campaign is where you can earn precious Hero Chips to evolve your heroes. Each campaign chapter usually features one hero, though some may have more. The Elite Campaign is essentially the game's hard mode, featuring stages with enemies that are significantly more powerful than in the regular Campaign. Additionally, in order to access a level in the Elite Campaign, you first have to beat that level in the normal Campaign.
Friend Campaign[]
The Friends feature unlocks at Team Level 25. After that, you can unlock specific hero friendships at different team levels. Progressing a friendship to Level 3 unlocks its Friend Campaign, which features stages that are strewn all over the map. Friend Campaign levels can be accessed either by finding them on the level select screen or by getting to them from a Hero's Friends screen.
For more information, sees Friendships.
Infected Levels[]
Prior to version update 2.3, Infected Levels were a phenomenon that could occur once every level in a chapter was completed and 3 starred. After meeting these conditions, one of the chapter's main levels could become Infected every once in a while - this would be indicated on the level select screen by a pink glitchy ring around the level's marker. After version 2.3, levels can no longer become Infected on their own, but you can Infect levels manually using a Virus item.
To clear an Infected level, you'll have to play through it normally to get rid of the infection, as Infected levels can't be raided. Infected levels are difficult to clear because they contain enemies that are much more powerful than when they're not infected, but they reward you with Disk Power in addition to all the usual rewards earned when clearing a level.
While Infected levels can't be raided by normal means, it's possible to automatically clear an Infected level by using an Antivirus, which effectively works the same way as a raid but also costs one Antivirus item to use.