Get all four apps in one of Apple's new bundles for just $8.99--this is a savings of $3 off of the regular price bought individually. Several of the apps have lite versions to check out, with in-app purchases for full content.
|Bundle for $8.99|
|See all available apps|
iPad only - $5.99
iPad/iPhone - $19.99 until 9/27, then $24.99
FREE Lite version
iPad/iPhone - $3.99
iPad only - $6.99
What's your favorite app to target inference and critical thinking?