Room full: wait or leave
What to do when every seat is taken, and when waiting one round beats reloading the page.
A room counts as full when the seat counter matches the number of players already inside and the ready button no longer responds. At that moment, pressing it repeatedly adds no seats; it only sends the same request again. The first thing to read is the seat counter at the top of the room rather than the button at the bottom, because the counter tells you whether a seat is genuinely gone or the page simply has not refreshed yet.
Do not reload the page over and over. Every reload drops the old connection and asks for a new place, and in a nearly full room a series of requests can put you behind someone who waited quietly. Reload once, wait for the current round to finish, then look at the counter again. If the number has not moved after one complete round, treat the room as closed to you and stop pressing.
Seats usually reopen at the end of a round rather than in the middle. A player who leaves during a match keeps that seat until the round is over, because replacing them halfway would change the result for everyone else. So the only sensible waiting time is one round, about two minutes. Wait until the board clears, then try once more, not before. This single rule removes most of the frustration around full rooms.
If you are the host, you have one tool that is rarely used: lower the seat count. A room opened for four but filled by two will keep waiting for two more. Dropping the limit to two lets the round begin at once, and the seats can be raised again when a third friend arrives. That is better than leaving four people watching an empty chair for a round they could have played.
Never open several tabs for the same room. The second tab looks like a second player to the server, so it can take the seat meant for you, or push the first tab out because the nickname is already in use. If you really want two players, use two different nicknames in two separate windows rather than two tabs in one window. One tab per player is the rule that keeps the room readable.
In a private room, ask the host whether somebody is sitting without moving. A player who joined and then walked away from the screen without leaving holds that seat, and nobody else can take it. The host can remove such a player, and that is usually the only way to open a room without waiting for the round to end. Ask politely; the person may simply have gone to fetch a glass of water.
In a private room, ask the host whether somebody is sitting without moving. A player who joined and then walked away from the screen without leaving holds that seat, and nobody else can take it. The host can remove such a player, and that is usually the only way to open a room without waiting for the round to end. Ask politely; the person may simply have gone to fetch a glass of water. If nobody answers in the room chat, assume the seat is genuinely taken and plan around it rather than waiting beside it.
If you are dropped because the room filled, do not immediately hammer the join button with the same nickname. Leave a gap of one round, then try once. Repeated attempts within a few seconds can look like a flood of requests, and some rooms will refuse that name for a short while. Waiting a full round is almost always more effective than pressing ten times in a row. Returning later usually works better than forcing the door open now, and the room will still be there in two minutes.