Feature: 1. Indication Screen: The sliding block puzzle has built in more than 500 electronic question banks, and questions are automatically issued through the built in indication screen 2. Progressive Difficulty: The digital sliding block puzzle has a progressive difficulty design, players can easily start the game from a simple start 3. Interesting Color: The chessboard and each piece are installed with magnets for glossy feel. with black chessboard and red, yellow and blue pieces for fun 4. Multiple Modes: Long press the L key of the sliding block puzzle toy to enter the teaching mode, long press the C key to enter the challenge mode, you can enjoy a happy gaming time with your friends 5. Digital Stickers: The travel games toys are equipped with digital stickers, which can be pasted on, and can be regained in order after moving the pieces Specification: Item Type: Sliding Block Puzzle Material: Plastic Length: Approx. 18.2cm / 7.2 in Width: Approx. 13 cm / 5.1in Height: Approx. 2.5cm / 1.0in (manual measurement, there will be 0 to 1cm/0 to 0.4in error) Level: 530 Levels. Package List: 1 x Sliding Block Puzzle1 x Digital Sticker1 x User Manual Note: Requires 2 x AA batteries for useShips without batteryNotes on battery usage:Different types of batteries or old and new batteries cannot be mixed. Please insert the batteries correctly according to the polarity instructions in the battery compartment. When the battery is exhausted or not used for a long time, it should be removed from the product to avoid damage to the product due to over discharge of the battery