Type Fu [1] uses this approach. You can choose between random words or random letters. The first level starts with letters or words that can be typed with the h

Type Fu [1] uses this approach. You can choose between random words or random letters. The first level starts with letters or words that can be typed with the home row keys and each subsequent level adds more keys. The levels are optimised for Qwerty, Colemak and Dvorak layouts. [1] http://type-fu.com/ http://type-fu.com/