How do you castle in chess?
Castling moves the king two squares toward a rook, and the rook jumps over to the square the king crossed. It is the only move where two of your pieces move at once.
You may castle only if neither the king nor that rook has moved yet, the squares between them are empty, and the king is not in check, does not pass through an attacked square, and does not land on one.
Castle early: it tucks the king away from the centre and brings the rook into play.
Try it
Castle. Only one side is allowed here. Tap the king, then the square two steps toward a rook.
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