Hey guys & gals, go back to the locked doors after you unlocked it, "don't open the doors" and look inside for the last 2 cards. I have all 13 cards.
Thanks! I went back to the unopened door, ran back and forth while pressing X like mad and got the light up items as well as the last two cards.
Here's the thing, all I see is one sparkle and that's it. The hint is like "What is so hot, but so cool."
It's like a Zen riddle you're never supposed to get.
;^) Heh. It's cold cash burning a hole in your pocket, of course.