$20, Windows, Mac OSX, Steam, PlayStation 4, Nintendo Switch

Teaches: logic, problem solving, temporal relations

$1.99, iPad, iPhone, Android, Kindle, Windows, Mac OSX, Steam

Teaches: logic, spatial relations

$0.99, iPad, iPhone, Android, Kindle, Windows, Mac OSX

Teaches: logic, memory, problem solving, spatial learning

iPad, iPhone, Android, Kindle, Windows, Mac OSX, Chrome

Teaches: English, Arabic, Czech, Dutch, French, German, Greek, Hindi, Hungarian, Indonesian, Italian, Japanese, Korean, Polish, Portuguese, Romanian, Russian, Simplified Chinese, Spanish, Traditional Chinese, Turkish, Ukrainian, Vietnamese

Windows, Mac OSX, Internet Site

Teaches: art, history

Windows, Mac OSX

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

Windows, Mac OSX, Internet Site

Teaches: science, space travel, history, astronauts

Windows, iPad, iPhone, Android, Chrome

Teaches: geography, science

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

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