How can I have a player go back to the lobby after completing a mini game. How do I also have a item that the player collected from that mini game be transported back into the lobby as a display.

Hello! Ive been making this game for a competition and have been confused on how to directly transport a character in and out of scenes after directly completing one of the mini games and is confused on how to directly start. I also want the way to get out is by gaining a certain item, after the item is gained it is put on display in the center of the map. Does anyone know how to do this?