DOJO class (7, 8 class 0f the 2nd grade)
The website, DOJO is very convenient for me because I can give points to the groups, using timer.
Students also like it because the groups' characters are very cute. They are actually doing their best to avoid getting minus point due to talking in their class, no homework, and so on.
I can send an invitation to students' parents or coworkers to give students points together.