$2.99, iPad, iPhone

Teaches: math, counting, math facts

$7.99, iPad, iPhone, Android

Teaches: comparing quantities, addition, subtraction, measuring, interpreting data, counting, Mathematics

$2.99, iPad, iPhone, iPod Touch

Teaches: music, rhythm, melody, math, counting, computer sequencing

$1.99, iPad, iPhone, iPod Touch (iOS 8.0 or later)

Teaches: math, creativity, problem solving, logic, gears, physics, physical science, torque

$3.99, iPad, Android, Kindle

Teaches: logic, math, spatial relations, art, mechanics, optical illusions, simplified Chinese, Traditional Chinese

$2.99, Android, iPad, iPhone, Kindle

Teaches: problem solving, math, fractions, logic

Windows, Mac OSX

Teaches: programming, debugging, logic, math, science, STEM

$2.99, iPad, iPhone

Teaches: math, counting, logic, addition, clocks, angles

$2.99, *iPad, iPod touch, iPhone

Teaches: fine motor coordination, racing, classifying, counting, letter recognition, science, math, logic

$9.99, iPad, Android

Teaches: Geography, nature, maps, using a GPS, math, history

$1.99, iPad Universal, iPad, iPhone

Teaches: math, geometry, spatial relations

$1.99, iPhone, iPad

Teaches: math, counting, quantities, numbers, money, Spanish

Apple II, IBM

Teaches: math, problems solving, spatial thinking, angles, computer programming

$20, Nintendo DS

Teaches: "mental training" (logic, math, spatial thinking, memorization)

$6080, Leapster

Teaches: reading, math, logic, music, memory

$89.95, Win 95, 98; Mac OS (CD-ROM)

Teaches: math, geometry, statistics, addition, multiplication, percents

$13, Mac, DOS, Windows (disk or CD-ROM)

Teaches: math, counting, sets, sequencing by size, shapes