This is purely hypothetical, just for fun. In this scenario, you don’t get to know who the GM is in advance, but they do have to run it as written. The players can leave whenever they like, but the GM has to stay until either all players leave or the players beat the dungeon.
@Susaga Every room references another room, by number. No page numbers or other references.
No statblocks. Just look up the statblocks in the Monster Manual, this splatbook for Druids, and an online PDF, available for free after signing up.