Watching the video to get a better idea - youtube video at https://www.youtube.com/watch?v=hlzvo5cZ-jo&t=7s On TeachersPayTeachers website the file is an exe file, but runs inside Microsoft Excel, it has a digital signature from Math Super Store. Anti-virus may flag it as dangerous, a PDF is included in the download. Two players, or teams, play on an interactive whiteboard. (The teacher sets the time to play - can be run as a tournament in class. The winner can play against the teacher.) Ma