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The paired queue, the shared placement and the ladder that has nothing to do with your solo rank. How a Double Up session runs, what moves between the two boards, and what counts as a win.
Double Up is the Teamfight Tactics queue where two players share one result, and it keeps a ladder your solo rank never touches. Here is how a Double Up order runs, why it can only ever be a duo, and what counts as a win in a mode where four teams are playing at once.
One lobby, four teams, one shared result
Double Up puts pairs into a lobby against other pairs. You each play your own board, but the placement belongs to the pair, and the team that outlasts the rest takes the lobby together. That is the whole premise, and almost every difference from standard ranked comes out of it.
How a partner's elimination is handled, and how far the surviving player can carry the pair after it, are the mode's own rules and they have been tuned between sets. The lobby screen and the mode description in the client are the place to confirm the current version rather than any guide.
What does not move is the incentive. Two boards that keep each other alive beat two boards racing each other, and a pair that finishes first on the strength of one board has a better result than a pair whose boards both finish mid-table.
Why the order is a duo, and how the session runs
There is no solo Double Up. The queue takes a pair, the rating is earned by the pair, and there is no version of the mode where the second seat is empty. That is why this order is scoped as a session you play in, with a booster in the other seat, rather than something you leave running while you are out.
You agree a window. Both of you have to be online at once, so the session is booked rather than started whenever.
You add each other in the client. The pair queues together from the lobby, the same as queueing with a friend.
Comms open before the first game. Voice or the order chat, whichever you prefer, agreed before the first queue and not during it.
You play your own board. The booster plays theirs. Neither of you plays the other's, which is why nobody needs anything from your account.
Comms, and what moves between the boards
The mode is built around the two boards talking to each other. You can watch your partner's board, and the sharing tools let units and items move across the pair under limits the current set defines. What can be sent, how often, and what it costs are set by those rules, so check them in the client for the set you are playing.
In practice the traffic runs one way more often than new players expect. The board that is already strong gets what it needs to close the game out, because one first place beats two fourth places every time.
Which is why the calls matter. When a booster asks for a piece you would rather keep, they are telling you which board the pair is betting on this game. Some games that is theirs. Some games it is yours, and you will be the one getting fed.
Booster tip: say at the start of the session whether you want the reasoning narrated or just the calls. A Double Up game has two players and one plan, and the explanation is free if you ask for it before the first lobby.
The rating is not your solo rating
Double Up keeps its own ladder. Rating earned there stays there, and rating lost there costs your solo climb nothing at all. The tier names look familiar, which is exactly why players assume the two are connected.
So if the number you want moved is the one on the standard ranked ladder, rank boosting is the service for it and Double Up will not touch it. If you want the Double Up ladder itself, or you simply want the mode played with somebody who knows it, this is the one.
What counts as a win
A win in Double Up is the pair finishing first in the lobby. Not your board surviving longest, not the placement you imagine you would have had in a solo lobby. The pair taking the lobby.
On a win-scoped order that is the unit being counted, and each one is noted in the order chat as it lands rather than summarised at the end. Placements below first still move rating, and a session full of strong placements is a productive session on the ladder, but a win order counts wins and nothing else. That cuts both ways, which is the point of counting it that way.
Where to go next
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