LeapFrog LeapStart 1st Grade Activity Book: Space Science and Thinking Like a Scientist (Requires LeapStart System) Requires LeapStart System to use. Works with all LeapStart systems (Sold Separately). Explore the way things work with the Letter Factory friends using science, technology, engineering, math and teamwork Teaches 16 pre-kindergarten STEM skills: reading simple graphs, experimenting with trial and error, using tools to solve problems and more Includes 40+ replayable activities and 25+ reward stickers Level 2: Pre-Kindergarten. Perfect for ages 3-5