Features: 1) 1-9 levels of difficulty 2) Automatically generated many different level puzzles 3) Automatic or hand operated on/off 4) Sleep function, it will enter the sleep mode after 10 minutes without operation 5) Automatic corrected the answers, automatically check the answers and show the correct ones as the sound 6) The unique design of cursor, the number of the question has the fixed cursor, which is convenient to be checked during the game checked during the flashing cursor shows the current position and it\'\'s easy to be moved 7) Large screen design of LCD 8) Reminding sound of key pressing, pressing different keys will have different sounds, which can prevent from the wrong operation Packing: blister card