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Place cards in a 4x4 grid. Try to make rows/columns that add up to 21.Totally free. No in-app purchases.A row/column will clear under the following circumstances: A) Adds up to 21. Score a point. B) Bust - Sum over 21. No point. C) When a row or column is full.You have one pass through the deck to make as many 21's as you can.