
- BGG rank
- BGG #7,852
- BGG rating
- 6.3
Ion: A Compound Building Game
- 2–7 players
- 20–40 min
- Complexity 1.4/5
- 2015

2016
Rules assistance for Covalence: A Molecule Building Game
Plain-language explanations of turns, card effects and disputed situations, with official source references and saved question history.
For 2 players

What would you like to know?
Answers come from the official rulebook, with the page to check.
Covalence: A Molecule Building Game is a board game released in 2016 for 2–4 players, 15–40 minutes per game, and ages 8 and up. It was designed by John Coveyou and its main mechanics are Cooperative Game, Communication Limits, and Pattern Building.
In Covalence, players work together to accurately reconstruct a number of secret organic compounds. One player takes on the role of the “Knower” who has knowledge of the secret compounds, while all other players, “Builders”, must deduce what these secret compounds are, based upon clues given to them by the Knower. All Builders must cooperatively utilize a limited number of clues available in order construct their compounds before the clues run out!
Covalence: A Molecule Building Game supports 2–4 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 Covalence: A Molecule Building Game is 15–40 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 Covalence: A Molecule Building Game for ages 8 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.
Covalence: A Molecule Building Game has a complexity rating of 1.7 out of 5 from BoardGameGeek players, which makes it a 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.
Covalence: A Molecule Building Game belongs to these categories: Deduction, Puzzle, and Educational. Its main mechanics are Cooperative Game, Communication Limits, and Pattern Building. 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 Covalence: A Molecule Building Game are: John Coveyou. 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 Covalence: A Molecule Building Game as a base game. It can be played on its own with the components in the box and does not require any other title. Expansions, if any exist, add new content or rules on top of it and are listed separately in the catalogue with a link back to this base game.