Okay, seems like in this puzzle the game already moved the king, so castling is impossible now.
Why can't I castle?
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Oct 17, 2021
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#3
Your King is on a black square and should have/probably started on a white square. Thus, you've moved it earlier.
Regardless of the fact that there's a better move here, the game doesn't let me castle. I'm not moving through check anywhere.