Note: At 1:30, I made a mistake calling the rule a bi-conditional. If it were a bi-conditional, then /Y→S. That’s just not true. /Y doesn't trigger S.
The correct interpretation of the rule is just a straight up "not both" rule, S→/Y.
Thanks to the 7Sagers who pointed this out.
If you had trouble with this game, you should practice the other Games that are similar to this one (listed below). That way, you'll learn to see how the Logic Games really are all the same. That's how high scorers see them and that's how you can improve your speed, accuracy, and score.
Start with the Games in the same set as this Game. Then, work on the Games in the other sets.
The Easy In/Out Games Set
PT24-Game1 | PT29-Game1 | PT36-Game1 | PT48-Game1 | PT54-Game1 | PT63-Game1
The Basic In/Out Games Set
PT33-Game2 | PT40-Game4 | PT45-Game3 | PT58-Game2
The Basic+ In/Out Games Set
PT34-Game4 | PT41-Game3
The Medium In/Out Games Set
PT20-Game2 | PT39-Game4 | PT47-Game2 | PT58-Game4 | PT59-Game3
The Difficult In/Out Games Set
PT31-Game2 | PT32-Game2 | PT49-Game3