I love Dreambox as an in class intervention. I assign students focus lessons on standards from earlier grades until they show proficiency.
I think it's an excellent tool that's aligned with CCSS math standards. I don't push the games, but instead talk to my students about the standards they've worked on and grown with.
How I Use It
I use it as a bell ringer at the beginning of the day. Students work at their individualized levels, which in our class is the lowest grade level standards that they haven't shown proficiency at, yet.