The wardrobe teleporters pop up once in 5,00 plays that are not necessary yours, this means 4,999 games have to be played by any people and you have to casually play the 5,000th game. Super tough, but that's the rate of appearance in the game, and the wardrobe screen pops up right before the "Do you want to play Hide-N-Seek?" screen, and not as some rumored, in the end of the game.