Training logic and playing with stickers. "Who's Under the Water is a notebook from the Logic with Stickers series. Witty and interesting tasks will help your child develop wit and thinking, get to know the inhabitants of the underwater kingdom - by thinking, sticking, solving. On the left side of the page, mark answers with stickers, and on the right side with a pencil. The book will also develop the baby's fine motor skills and entertain the future student for more than one evening.