Antique Board Game年代物のボードゲーム

An ancient game for two players, there is no rulebook but apparently it was about shifting blocks around.
In-game description

What is Antique Board Game? Features and uses

Antique Board Game is a poor item in Core Keeper (Valuables). It can be obtained from Archeologist Wall Loot.

Antique Board Game key points (from the game data)

Best source: Archeologist Wall Loot — 10.5% chance per roll.
Sells to merchants for 63 Ancient Coins.

Calculated and summarized by this site from the game data (1.3.0.6).

How to get Antique Board Game (Mining walls)

Mining walls (1)

There are also sources whose in-game name has not been confirmed yet (Mining walls: 1).

"Chance" is the chance to get at least one of this item per try (opening one chest, defeating one enemy, one catch). A "guaranteed group" is the group of a chest or boss from which exactly one item always drops; it does not mean this item always drops (the chance of it being picked from that group is shown in small text). Only items that always drop are marked "Guaranteed". Fishing means catches with a fishing rod, separate from enemy and boss drops. Calculated from the game's drop tables (Conf/Loot, 1.3.0.6) the same way the game rolls them.

Other ways to get Antique Board Game

Placed in or on the Blue Glass Pedestal found inside a scene (building, ruin, camp and so on) (guaranteed)Where: City Games Room [Sunken City]

Scene containers, dungeon placements, guaranteed drops and natural spawns are based on the Obtaining data of the Core Keeper Wiki (Fandom) (CC BY-SA 3.0), because these are not in the game files this site reads. Scene names are the wiki's English names.