ELECTRONIC PROGRAM : Up to 530 questions satisfy players with different proficiency. Teaching mode tells beginners how to play step by step. Challenge mode provides master players with time limited challenges. MAGNETIC DESIGN : The magnetic suction design offers a smooth touch feel while moving the blocks. The strong suction force makes the blocks not easy to fall. A storage area prevents blocks loss. VICTORY SENSING : It automatically senses the success of puzzle solving. The screen plays the salute special effects, and the speaker plays the victory sound effects. Made of high quality ABS plastic, safe for skin. slide puzzle can inspire logical thinking and finger mobility. Slide puzlles are great gifts for boys and grils.