
- BGG rating
- 8.0
Istanbul: Big Box
- 2–5 players
- 40–90 min
- Complexity 2.5/5
- 2018

Rules assistance for Istanbul: Letters & Seals
Plain-language explanations of turns, card effects and disputed situations, with official source references and saved question history.

What would you like to know?
Answers come from the official rulebook, with the page to check.
Istanbul: Letters & Seals is an expansion for Istanbul released in 2016 for 2–5 players, 40–60 minutes per game, and ages 10 and up. It was designed by Rüdiger Dorn and its main mechanics are Dice Rolling, Grid Movement, and Modular Board.
You, the merchants of Istanbul, have come up with a new and quite lucrative way of earning extra money: delivering messages to the shopkeepers of the bazaar! While doing so, you can catch some useful information here and there that you can sell to the secret society for rubies. In order to keep your regular business running, you have hired a companion who is actively supporting you. True, he is a little slower than you would like but in return he does not require any assistants. Istanbul: Letters & Seals is an expansion for Istanbul.
Istanbul: Letters & Seals supports 2–5 players according to the catalogue. This range comes from the publisher’s listed player count, so the game can be set up for any group size within it. Some setups, rules and scoring details may still vary by player count, so check your edition’s rulebook for the exact configuration.
The listed playing time for Istanbul: Letters & Seals is 40–60 minutes. This is the publisher’s estimate for a full game. The actual duration depends on the group, the player count and familiarity with the rules: first sessions usually run longer, while experienced groups often finish faster. Setup and teaching time are not included in this estimate.
The catalogue lists Istanbul: Letters & Seals for ages 10 and up. This is the publisher’s recommendation and reflects reading demands, rule complexity and small components rather than theme alone. Younger players can often join with help from an adult, so check the age guidance on your edition and consider your group’s experience with board games.
Istanbul: Letters & Seals has a complexity rating of 2.8 out of 5 from BoardGameGeek players, which makes it a medium-light game. The rating reflects how much rules knowledge, planning and decision-making a typical game demands. Expect a longer first teach for heavier games, and use a preparation guide before game night.
Istanbul: Letters & Seals belongs to these categories: Economic and Expansion for Base-game. Its main mechanics are Dice Rolling, Grid Movement, and Modular Board. Categories describe the theme and setting of a game, while mechanics describe what players actually do on their turns. Each mechanic links to a catalogue hub with similar games, which helps when you want something comparable.
The credited designers of Istanbul: Letters & Seals are: Rüdiger Dorn. These credits come from the published game data and name the people responsible for the game’s design, not its illustrators or publishers. Designer pages on MeepleRules collect other titles by the same designers, which helps when you enjoy a game and want to find similar ones.
The catalogue lists Istanbul: Letters & Seals as an expansion for Istanbul. Expansions add new content, rules or scenarios to the base game and usually cannot be played on their own, so you need Istanbul to use it. Check that your edition of Istanbul is compatible, as some expansions were revised between editions.