Here's a puzzle that gamifies addition - a fundamental skill in math. The first person to pick three numbers that add to fifteen wins.
But here's a twist - you have been captured and put in prison unjustly. The cruel prison warden offers you a choice - beat him in a game of "Fifteen" and you go free, lose and you are put to death. The warden has already defeated several of your fellow inmates. Can you figure out a winning strategy and win your freedom?