In elementary school, my class would play a game called 24. The teacher would hold up a card that had 4 numbers on it. Using each number on the card exactly once and only  for operations, the goal was to make the number 24. And do it faster than all the other kids, obviously.

A couple days ago, one of my friends gave us a particularly good one. So I thought I’d share the 5 hardest 24 puzzles! Some other people have already gone through the trouble of figuring out which are the most difficult. Enjoy!

#5: 1,3,4,6

Solved rate: 16.3%

#4: 3,6,6,11

Solved rate: 15.6%

#3: 3,5,7,13

Solved rate: 13.5%

#2: 2,5,5,10

Solved rate: 12.4%

#1: 2,3,5,12

Solved rate: 11.7%