Okay, well from the entrance of the basement, go all of the way to the left where there is a switch where you have to have a magic boomerang to hit. Then go up. You will have to cross the lava steps, hit the eye statue with an arrow, solve a block puzzle, and it will lead to a key. Then you can open that door you were talking about to get the magic boomerang.
Hero of Dreams super bug
Thanks!I got it now! 😃