I need help on a game called 'schoolrooms'

i am creating a backrooms fan-made called the “schoolrooms” but I dont know how to make the players move, then I found out because the ‘player’ sprite is stuck on the ‘floor’ block, how to I turn nothingness into black?

Explain what you mean by “nothingness into black”. Can you send a link to the game?

the floor in this game is empty but it looks like sand, how do i turn emptiness into black

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I’m still confused with what you mean, do you want the sand to fade into black?