Board Game Arena

I didn't find any information on the game's profile.

Square rule is that if you make a square of your color you can take out one or two balls from the board.

Advanced rule add a rule to the square one: you can take one ball out or two if you can align 4 balls of your colour in the first floor, or 3 balls in the second floor.

How can I see, which rule is set in the game?

in the game, below the table, there is the tab "options".
before you enter, in the list of open tables, you can see it too, right under "free spots"