You can play in 5 different difficulties: Super easy, Easy, Medium, Hard and Super hard. Red Block is the oldest and most difficult puzzle ever! Are you smart enough to solve it? Antique civilizations used to use this puzzle to measure people intelligence. Only 1% of population is able to solve the hard levels, are you inside this minority? Try to solve it now! Visit our website: http://ftapps.com Follow us in twitter: @ftapps