This week in children's apps features Curious About Shapes and Colors, which sees Curious George exploring colors and shapes through matching and sorting games. Also this week is Dr. Seuss's The Butter Battle Book, a story of the long-running feud between the Yooks and the Zooks, who argue over which side of the bread to butter.

Title: Curious About Shapes and Colors

Publisher: Houghton Mifflin Harcourt

Release date: May 14, 2013

Price: $2.99

Background: Curious George had so much fun with his toys that he’s taken some of them apart and mixed them all up. He needs help to put them all back together. Designed to help children learn about shapes and colors through matching, sorting, and pattern games.

Features: Narration and guidance from the Man with the Yellow Hat.

Title: The Butter Battle Book - Dr. Seuss

Publisher: Oceanhouse Media

Release date: May 15, 2013

Price: $3.99

Background: The Butter Battle Book tells the tale of the Yooks and the Zooks who are in a long-running feud. The Yooks eat their bread with the butter side up, while the Zooks eat their bread with the butter side down. The two groups do not see eye to eye, so they develop more and more elaborate weaponry to outdo each other. From a Triple-Sling Jigger to a Jigger-Rock Snatchem, who will win the battle in the end?

Features: Professional narration, background audio and enlarged artwork, three modes of play.