Catch-21 Rules
Click on a column to move the top card there. The yellow arrows show you which are available.

Clear columns by making them add up to 21.

You can also clear a column by putting 5 cards in it, but the sum of the cards must be 21 or less.

The two Black Jacks can be played on any column to clear it.

You can discard the top card by clicking on it or the discard pile.

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