You can pass two kinds of things in Room 58 of the Rubik's Cube. One is 20 Rubik's Cube universal cards, so you need to prepare enough cards in advance; the other is 2 gold medals. If you come in, you choose to hand over the gold medals. One gold medal can be obtained from past missions, and the other can be obtained from killing a player, or can be purchased from the player in room 1 of the starting point of the Rubik's Cube. If you don’t buy it, you can also run it twice to clear the level once. The method is to return to the city after accepting the task of handing in the gold medal, get another number in Room 1, and trade it to this number, but do not make a Rubik’s Cube with this number. Next time you run When the time comes, trade back.

It's a bit of a loss to hand over 20 universal cards, I usually trade gold cards