/jp/ - Otaku Culture

>watching episode of kakegurui
>it's fucking shit, but it's the closest thing i'm going to get to gambling in anime for a long fucking while
>episode is about a puzzle tower
>each floor has a puzzle, if you clear it you can go to a lower floor
>basically need to get from the top to the bottom and back to the top
>first floor they spend around 2 minutes discussing what the answer could be
>next floor, they show the puzzle and spend around a minute on the floor
>third floor, is pic related
>"oh baby, some Mahjong"
>literally inputs "1" into the keypad, and leaves the room
>doesn't even explain why, unlike the other two puzzles

Does anyone know WHY it's 1 (assuming it's the 1 pin, and not the first tile), I have no clue what the answer should be, and seeing her input just "1" was confusing as well.