What is that which Alexander Mahone is playing in Prison Break?

What is that which Alexander Mahone is playing in Prison Break? - Person with Tattoo Holding Domino Pieces

In the first episode of season 2 in Prison Break, When Mahone is asking the other guy to read the case of each escapee, He is playing some kind of crossword puzzle. I think I saw the word quote in the puzzle's title. Would you please shed some light on it?

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What is that which Alexander Mahone is playing in Prison Break? - Man in Orange Uniform Sitting on Gray Chair

What is that which Alexander Mahone is playing in Prison Break? - Man in Orange Clothes Holding a White Domino Tiles

What is that which Alexander Mahone is playing in Prison Break? - Inmates Playing Basketball

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