You can adjust the number of fingers chosen as well as have it create groups for the user (check the upper left of the screen for those options).
Embedded below is a GIF followed by a 1 minute and 9 second YouTube tutorial.
Thanks to Tony Vincent for Tweeting about this. See Tweet below
🔘 Chwazi Finger Choose is a handy app when working with small groups of kids.https://t.co/vAQ26ljaDg#12DaysTwitter pic.twitter.com/RWumJxTpX6— Tony Vincent (@tonyvincent) December 6, 2016