Peekaboo Barn is a farm-themed educational game designed for toddlers, from which kids can learn about animal sounds and names. Fittingly for this age group, Peekaboo Barn has a very simple and satisfying schtick: a red barn bounces up and down gently as you hear a muffled animal noise. You tap the barn to open its doors, revealing the now-louder animal. Its name appears, and is also spoken aloud (charmingly, by a fellow toddler in English, or by an adult in Spanish mode).
The game cycles through 10 different farm animals in this way--everything from a cat to a cow to a goat--and after the final animal is revealed, night falls and the game ends as the animals go to sleep. You can also change the settings to play the animals in a continuous loop.
Peekaboo Barn stands out for its high-quality illustrations, clever touches, and clean, thoughtful design. The game's only shortcoming is its length (it is quite short and easily mastered by older toddlers), but Peekaboo Barn is definitely one of the very best apps available for this age group.