A grid of shuffled numbers: tap 1, 2, 3... in order as fast as you can while your eyes stay on the centre. The classic Schulte exercise trains attention and peripheral vision - a good two-minute warm-up before reading or work. Time and training modes, 3x3 to 7x7 (up to 11x11 in the full version), letters, five colour schemes and the classic Schulte statistics. Free on Android.