Hunting vigorously through the lazylaces archives for "no1game.net/games/escapegame" unearthed the following results...
the cake, were lie. There have only ever been 5 other escape the room games, and now there is also "Escape Game 6" [subbed by subzero].
Escape Game 5. They even handily numbered it for us to avoid any confusion. True story [found via no1game].
Escape Game 4 we learn just how many cunning, and really quite enjoyable, puzzles can be hidden in a seemingly featureless yellow room [subbed by f00].