If a player inadvertently exposes the wrong tiles or exposes too many jokers, they can add to or take away from the current exposure as long as they have not discarded. After a player has discarded, exposures on their rack cannot be changed.
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There is a common house rule is called, "Wall Game Kitty." Here's how it works:
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A “pie” is a limit set by players. Players start with $5 in coins to pay the winner.
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Playing with hot and cold walls are consider table rules and not sanctioned by the National Mah Jongg League.
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The NMJL does not support house rules because they feel they are not conducive to the game and may lead to arguments.
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In the early years of the game, many groups started with their "future pick from the wall".
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