This reading and vocabulary exercises are based on the reading method safely learn to read Kim version. This app contains 35 sets each with 12 words so 420 words divided into 11 cores. From easter Kim this version can also be easily used by ordinary users of Safe Learning Reading version. I've created these exercises relying on my 25 years experience as a teacher, 1st grade. All exercises are supported both visual and auditory. Headphones make the sound even better. Works best on tablets. Not suitable for smartphones. Black screen = charging time (+/- 50 sec) .start somewhat quicker at next use. Billiau Danny.