About 5 months ago I wrote about Rows Free which is a puzzle app that is similar to the card game SET.
My high score is 22,613. That was one game and it took 2 continuous hours.
Today, I see that Joy1127 is the world leader with 523,637. That score would take me about 26 hours - without making a mistake! So Joy1127, if you're reading this, please contact me and inform my readers how long it took you.