SK-0101 and SK-0201 features: 1) Three levels of difficulty 2) Many different level puzzles automatic generated 3) Automatic or hand operated power on / off 4) Sleep function: it will enter the sleep mode after 10 minutes without operation 5) Automatically check the answers and show the correct ones with a sound 6) With a unique design of cursor; the number of the question has the fixed cursor, which is convenient to be checked during the game; the flashing cursor shows the current position and it\'\'s easy to be moved 7) Large screen design of LCD 8) Contains 4 x 4, 6 x 6, 8 x 8 and 9 x 9 selections Outer packing: 80pcs/ctn Carton dimensions: 76.0 x 43.5 x 42.0cm N.W.: 17kg G.W.: 19kg SK-0301and sk-0301 features.: 1) 1 - 9 levels of difficulty 2) Automatic 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 corrects answers, automatically checks answers and shows correct ones as sound 6) The unique design of cursor and 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