The app presents a game where players defend a castle from aliens by correctly answering geography questions about national flags. It offers 45 levels across 5 stages, suitable for various ages, and supports Game Center for score comparison.
Learn computer science through animated visualizations of their execution. Track variable values and pseudo-code line progression. Refresh knowledge with summaries of each algorithm's main characteristics.
Solve 6x6 with grids containing digits 1 to 6. Fill rows, columns, and 2x3 boxes without repeating numbers. Track progress and attempt to complete in minimum time.
Practice mental by adding flashing numbers before they disappear. Play multiple rounds with increasing difficulty. Track progress and replay previous sessions to improve speed and accuracy.
Play by filling 9x9 grids with numbers 1-9. Ensure no duplicates in rows, columns, or 3x3 boxes. Access 5000+ daily. Track progress and solve to improve logic and memory.