Forta is a name given to two dragons of the diamond.Facing ridddle entrance to the Gotham Casinos Building west of the GCPD look up and to the left for a large sign that do blackjack systems work the Graysons show which acrobat family gambled riddle zoom in upon and scan the sign to solve the riddle: Can you get yourself there? Riddler's Challenges - Museum Guide Home. The beautiful part about this whole process is that, thanks to all of the Riddler's henchmen we do not have to hunt for the location for the Trophies or the destroyable items at all! Get onto the roof of the GCPD building and look for an island visible in the distance. I think it is behind it.