Secrets and Rumours for me. The level of dedication on this hack is most admirable, and the sheer idea of it itself warrants it the coolness factor. Just because it's based on older games doesn't make it any less impressive than all of the Advance hacks, and should not be overlooked for the older graphics style.
The small team working on this do a LOT of research into how to do certain things through hacking, and also looking into the rumours themselves. They are creating something we all LONGED to be true back in the day, so has pure nostalgia as well as freshness, two things that make a perfect experience for a player. This will be my hack of the year.