Operation Math Code Squad gets up to 4 kids together to take math operation challenges. Using the same theme as the well-loved Operation Math app from Spinlight Studios, the teams of kids playing are challenged to answer math problems in order to complete missions. The app does rank players, but is thoughtfully designed to get kids supporting each other instead of pitting them against each other. If you want to keep playing, all players need to answer questions correctly. Game play includes all operations and is easy to customize for the unique level of multiple players. The app is easy to use and fun for group play. One struggle we had was telling the difference between the numbers 9 and 6, which you often have to read upside down; this it was hard to do quickly because the numbers were spinning in the middle of the screen. This would be a great multi-player app to use to practice math facts. Operation Math Code Squad costs$2.99 and is available for iPad.