Games can seem entirely innocent and can be completely fun--up until the illusion's ruined.
The first game I really even knew of Mirror was a game she and the Judge called Gambler put on. We played a card game, against our reflections. Or so it seemed. Vulpecula discovered after throwing a table through our mirror that Cepheus was behind the glass, injured for each time we cheated. We were injured whenever they cheated. The point of the game was to cheat.
That's when Mirror cried and some blanks tried to help, other blanks mocked and sneered. [shrugs] I just apologized and snapped at Gambler for not telling the truth of what type of game it was.