I said built [i]ON[/i] grinding gear, not [i]for[/i] grinding gear. Not even CLOSE to the same thing.
Building a game [i]on[/i] grinding gear means that the gear being grinded [i]for[/i] is also the foundation of the game; take away that gear, and you inadvertently take away the [i]foundation[/i] of the game.
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The words I said mean the same (in a literal sense) but thanks for clarifying what you meant.