Quoted from Gamefaqs:
Unlock TOFU
The EASIEST way to unlock TOFU is to beat Leon A, Claire B, Leon A again, Claire B again, Leon A again and then Claire be again to unlock TOFU. All those games must be on Normal, not Easy or Arrange.
There is a harder way.
The HARDEST way to unlock TOFU is to beat Claire A, Leon B, Claire A again, Leon B again, Claire A again and then Leon B again to unlock TOFU. All those games must be on Normal, not Easy or Arrange.
I've done it before, too, so I know it works.
SIR, YOU ARE UNQUALIFIED TO OWN THIS TOPIC. PLEASE HAVE YOUR RESIGNATION ON MY DESK BY 3PM.
Here's a pic in case you still don't believe me: