Ishidō is a cosmic mystery: a board game independently developed by every culture in the ancient world, only to vanish from sight for thousands of...
...okay, so that's just a yarn they made up for marketing purposes. Ishidō is a computer game invented in 1989. It's so simple-yet-compelling that you can almost buy into the legend, though.
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In keeping with the game's flavor, Ishidō's debug menu is practically a Zen koan.
The title of the MENU resource itself is slightly more descriptive: "Dev Stuff". The same resource appears in the color and monochrome versions.