Question: In a scenario where someone calls a tile while another player picks a tile and looks at it, should the player who picked hide the tile in a random position in the wall?

Answer: To ensure the fairness of the game, it is crucial to maintain the integrity of the tile picking process. If a tile is picked from the wall and viewed by a player, it must be returned to its exact original position in the wall. It is never permissible to place the tile arbitrarily in a different position within the wall even if it has been seen by a player. This ruling is not in Mah Jongg Made Easy.

Source: National Mah Jongg League Bulletin (2021)