Recommended group sizes have been prepared based on the size of the room and the puzzles involved. However, we will consider requests for an additional 1-3 players, as long as the room can accommodate. The limit for each room is displayed on the individual page. You simply reserve the room for the expected number of people and pay for the extra guests upon arrival having prearranged for the additional people. Please contact us beforehand to ensure that new people can be accommodated.