Phineas And Ferb Hidden Letters is an online game at 43g.Com. You can play Phineas And Ferb Hidden Letters in your browser for free.Find all the hidden letters in these pictures of Phineas, Ferb and other characters from the kids show, Phineas and Ferb. Beat all five levels to beat the game. Every correct find will give you 50 points and every incorrect find will minus 15 points.