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The object is simple: build a puzzle solution between the red gear and the yellow wheel. When the gear teeth interlock, you'll be able to turn the wheel and send the whole contraption spinning!Start by choosing a puzzle of your choice (there are four levels of difficulty so the whole family can play!).Slide the card under the clear grid, then place the red gear and yellow wheel as indicated. Each puzzle will show you an array of color and sizes of gears, and how many of each you'll need (you'll see them printed along the bottom of the card). Pull those out (you MUST use all of them!).Now: solve that puzzle!Think you’ve solved the puzzle? Give the yellow wheel a turn and see if your contraption spins! If the red gear spins along with all of the gears you MUST use, you have just engineered a solution to the puzzle!If not, return to your design board and give your problem-solving skills another whirl!Crankity BrainteaserIt's a gear-connecting, brainteasing contraptionEncourages problem-solving, critical thinking, concentrationGet your brain cranking!Perfect for travelMultiple solutions to each puzzle are possiblePlayer must use all gears printed on the puzzle cardYou can move any of the gears around the grid except the red and yellowGears must fit into a peg holeGears may extend over the edge of the playing surfacePlayer may or may not have to use all gears to complete a puzzle (see puzzle for pieces you MUST use)Four levels of problem-solving (Easy, Medium, Hard, Extra-Hard)Includes: 15 gears, gear tray, storage bag, 40 puzzles