As a lay boardgamer, what makes a board game abstract?
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There are also games with themes that don’t really help make sense of the rules — the theme is just pasted on. These are still considered abstract, despite technically having a theme.
The “ameritrash” genre are known for having strong themes that tie to the rules of the game. E.g. a lot of co-op games with plastic figures.
Old school euro games often have a pasted on theme, and are more abstract.