Hope you're having a great week! - Looking for math app games for kid

I'm looking for a math related app game for kids where they can have fun but at the same time develop their math algebra skills.

I'm asking because I'd like to get my niece more motivated on her studies of math subjects and the one she needs the most help with is with algebra 1. She's in grade 7 and she's already getting some algebra/math help with this app but it doesn't provide much of the "fun game" part I'm looking for, iit's more of a traditional way of practicing math. In the area we live there aren't many algebra tutors near me (or at least not ones that I like) that's why the extra motivation of looking for an online tutor / online help tool, it doesn't have to be free it could be a premium subscription.

Anyways, sorry for the long post,  any suggestions would be greatly appreciated.

Have an awesome day!
-Erin