Solve arithmetic puzzles by replacing letters with digits to form correct equations. Each letter represents a unique digit. Track progress and attempt increasingly difficult challenges.
The app allows users to color a map of Russia with four colors, ensuring no adjacent regions share the same color. This feature allows users to explore geography and learn about Martin Gardner's country.
The app offers over 1000 fairy tales, including works by Andersen, Pushkin, and the Brothers Grimm. It allows users to record stories with their voice and access all texts without internet.
