Yeah, some of us just listed the game as mystery game last time. Ill admit it worked on me, I entered every single one I could. Its not even about winning the game it just makes you want to know what it is. I would put one as a mystery game myself for the keys I have left, but I kinda feel like it would seem more like I was trying to hide a not that great game since I dont believe I have anything that great left over.
Maybe one day giftbot will allow OPs to set which flags can be used in a given thread.