While Goku is the main character of Dragon Ball, it could be argued that his son Gohan has received the most character development throughout Dragon Ball Z. That's something Dragon Ball Sparking Zero explores further through his various paths.

There are fewer general stages in Gohan's Episode Battle mode campaign compared to some of the other characters in Dragon Ball Sparking Zero. The good news is that unlocking Gohan's side missions only requires you to excel in combat, rather than the convoluted method of getting one of Vegeta's branching paths or the choices you have to make in Goku's side stories.

Gohan only has one major sidetrack, but it explores a "what if" scenario that is such a hard departure from established canon and yet makes so much sense in the context of Dragon Ball Z's story. Which is:

The condition to unlock this side story requires a fair amount of skill against a tough enemy. It can be tricky to complete in time, so our Dragon Ball Sparking Zero tips and tricks should help you get better at fighting. Unfortunately, while one of his side stories grants you victory in the Universe Survival Tournament, getting there in Gohan’s campaign won’t unlock the Dragon Balls, as it’s not technically a victory.