# Join a Game Room With a Code: Five Letters, No I or O - Author: Bomb Appétit (https://bombappetit.com) - Published: 2026-10-20 - Category: Playing online - Canonical: https://bombappetit.com/blog/join-a-game-room-with-a-code-five-letters > How to join a game room with a code: reading five letters aloud, why I and O never appear, the room link, your name, and what to do when a code fails. To join a game room with a code in Bomb Appétit, open the Play page, type the five letters your host sent into the Room code box and press Join. Then type your name and press Join again. You arrive as an Expert, and can take the Defuser seat if nobody holds it. ## Reading a game room code aloud without mix-ups A room code is five capital letters, and the safest way to say one is letter by letter with a word for each. "K as in kite, M as in mango" stops the classic confusions between letters that sound alike, such as M and N, or B, D, P and V. The host reads, the guest writes. A guest who repeats the code back before typing it catches most mistakes in a second, which is faster than a failed join and a second attempt. Spelling words do not need to be an official alphabet. Any word the group knows works, as long as its first letter is unmistakable. Avoid words whose first sound could be heard two ways, such as "knife" for N or "photo" for F. Typing beats speaking whenever a chat is open. A code pasted into the call's chat or a text message cannot be misheard, and it stays on screen for latecomers. Case does not matter when typing: the room treats lowercase letters as capitals. ## Why does a game room code never have an I or an O? A Bomb Appétit room code never contains I or O because those two letters look and sound too much like the digits 1 and 0. Codes are drawn from the other twenty-four letters of the alphabet, so a player who sees a shape like a zero can be sure it is a letter. The game's own code says why in one line: I and O read as 1 and 0 when a code is said aloud. Leaving them out removes the question "is that an O or a zero?" before anyone has to ask it. It also means a code is never a mix of letters and digits. Every one of its five characters is a letter from A to Z, minus those two. A code that seems to contain a digit has been copied wrong. ## Joining by the game room link instead of the code The room's web address is a faster way in than the code. It ends in the code itself, so a host who pastes the room page's address into a chat gives guests a link that opens the join screen for that room directly. Nothing needs typing except a name. The room page suggests this itself: read the code aloud, or share the page's address. A link suits a group already chatting in text. The spoken code suits a group on a phone call with no chat window. Here is the full path for a guest, from receiving the code to standing in the lobby with a seat. The code in the example is invented. 1. **Receive the code or link.** The host sends "HKRWT", or the room's address ending in it. 2. **Open it.** Either open the link, or go to [Play](/play), type HKRWT in the "Room code" box and press "Join". 3. **Read the join screen.** It says "Join room HKRWT" and how many players are already there. 4. **Type your name and press "Join".** One to twenty-four letters or numbers. Spaces and a few marks such as hyphens are allowed. 5. **Check the player list.** Your name appears with the word "you" and an Expert badge. 6. **Choose your seat.** Stay an Expert, or press "I will be the Defuser" if the button is free. If it names someone, that seat is taken. 7. **Wait for the host.** The lobby says "Waiting for the host to arm the bomb" until the host starts the round. How the room uses that code to link browsers in different places is explained in [how a room code connects browsers far apart](/blog/multiplayer-browser-games-to-play-with-friends#how-a-room-code-connects-browsers-far-apart). ## What does "room not found" mean for a game room code? "No room with that code. It may have expired." means the server has no live room under those five letters. Either the code was copied wrong, or the room has passed its six-hour lifetime. The page then offers a button to create a new room. Rooms last six hours from creation, however much they were used. A link from yesterday's game will always give this message. Ask the host for today's code. Three messages cover most failed joins: - **"No room with that code. It may have expired."** The code is wrong or the room is over six hours old. Check the letters with the host, then ask for a fresh room. - **"This room is full."** The room already has four Experts beside its Defuser. You will need to wait for a free seat; what a sixth player can do meanwhile is in [what happens to the sixth player](/blog/6-player-online-games-when-one-bomb-room-is-full#what-happens-to-the-sixth-player-in-a-five-seat-room). - **"Pick a display name of 1 to 24 letters or numbers."** The name is empty, too long or uses characters the room does not accept. Shorten it or drop the symbols. ## The game room code mistake: typing digits for letters The most common typing mistake is entering a digit where a letter belongs, often a 0 for what looked like an O. Since codes never contain O, or any digit, the Play page's join box will not accept the entry, and a typed address with a digit in the code leads to a page-not-found screen. Both reactions point the same way: the code is letters only. If the code looks like it holds a 0, ask the host to spell it with words. If it seems to hold a 1, it is probably an L or a J read in a small font. The same slip happens with lookalike letters even without digits. A U and a V, or an H and an N, can blur on a small phone screen. Spelling words fix that as well. Codes for large calls deserve extra care, because several rooms run at once and a mistyped code can land a guest in a stranger's lobby. Running one room per small group is set out in [one bomb room per Zoom breakout](/blog/zoom-breakout-rooms-games-one-bomb-room-per-breakout). For a group whose friends sit at a mix of laptops, tablets and phones, see [online games on different computers](/blog/online-games-to-play-with-friends-on-different-computers-mix). The wider picture of rooms is in [multiplayer browser games to play with friends](/blog/multiplayer-browser-games-to-play-with-friends).