Pepi Tree (free Lite version available, full version $1.99) is a fun little app presenting "mini-games" at different levels of a tree, all illustrating in some way the life and "work" of animals in the forest. Mini-games are an interesting concept for therapy, as they can be used as different contexts for concepts, language structure and vocabulary development within the same app. For example, within this app, the caterpillar mini-game can be used to target sequential words (the caterpillar eats a leaf, then goes into a cocoon, and finally becomes a butterfly) as well as some/all (he needs to eat all of the leaf before going into the cocoon). There is also a fox-feeding activity that can be used to address negative words (the foxes don't like all the food) and one emphasizing the curriculum concepts around what plants need to grow. It's definitely worth grabbing the Lite version for your young students and deciding if you'd like all the games in the full version.