Chess CT is multi-level version of CT puzzle. Rotate as Rubik's cube and match numbers at all angles (projections). Free 5x5 version at 4 projections is on App Store as Touch CT. Free 4x4 version at 2 projection is available as CT Kids (age 5+, player should be able to recognize numbers and count 1-4). Kids Num introduces to the first numbers in 3 languages (0+).