
- BGG rank
- BGG #4,426
- BGG rating
- 7.5
Tsukuyumi: Full Moon Down (Second Edition)
- 2–4 players
- 90–180 min
- Complexity 3.7/5
- 2020

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

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Answers come from the official rulebook, with the page to check.
Tsukuyumi: Sentinels is an expansion for Tsukuyumi: Full Moon Down released in 2018 for 3–5 players, 90–150 minutes per game, and ages 12 and up. It was designed by Felix Mertikat and its main mechanics are Variable Player Powers, Area Majority / Influence, and Modular Board.
It is their holy quest to save earth from the Oni. They are mystic warriors, arising from the Jade Kingdom, a realm in which all surviving otherworldly creatures found shelter, after humans began killing and hunting them. The Sentinels still protect the earth whenever Oni walk it. So they return through their jade portals. Possessed with the magic of ancient times, like the Kami had, they can hide in plain sight. Their jade armor hides them, when a mortal is looking at them. As Oni appeared in several times during earth's history, the Sentinels adapted to these times. Although they are ancient warriors, some use modern technology while others stay traditional. But in the end, they are here to save the earth - but not the humans anymore. They walk between both worlds, the protectors of two realms. Playstyle: The Sentinels are the first game changer faction for Tsukuyumi. They modify the game dramatically, as they have a special winning condition: If there are no more Oni on the board, they immediately win - both, if they killed the last Oni or any other player did. In this case, no score points are counted. If they are not able to kill all Oni before the end of the game, they are awarded score points for killing Oni units. Instead of placing a homezone, they place six portal markers next to which they are allowed to place new units. Sentinel units are even allowed to move from one area with a portal to another of its kind for only one movement point. Any unit has at least one exact copy in play, representing its camouflage. Both standees can be moved separately and are treated as real. Only in battle, the player has to decide which of both standees is the real unit.
Tsukuyumi: Sentinels supports 3–5 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 Tsukuyumi: Sentinels is 90–150 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 Tsukuyumi: Sentinels for ages 12 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.
Tsukuyumi: Sentinels has a complexity rating of 4.0 out of 5 from BoardGameGeek players, which makes it a heavy 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.
Tsukuyumi: Sentinels belongs to these categories: Fantasy, Fighting, and Science Fiction. Its main mechanics are Variable Player Powers, Area Majority / Influence, 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 Tsukuyumi: Sentinels are: Felix Mertikat. 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 Tsukuyumi: Sentinels as an expansion for Tsukuyumi: Full Moon Down. Expansions add new content, rules or scenarios to the base game and usually cannot be played on their own, so you need Tsukuyumi: Full Moon Down to use it. Check that your edition of Tsukuyumi: Full Moon Down is compatible, as some expansions were revised between editions.