Countdown Game. Use the nine numbers to create the given number.Watching the video to get a better idea - youtube video at https://www.youtube.com/watch?v=apI7zSrebYk&feature=youtu.be 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.