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ThinkFun Family Brainstorms Challenge of the Week

Each week we feature a new puzzle that you can print out in black and white on a single page and use as a black line master with your students. Schools have reported great success by encouraging families to work on the puzzles together at home. Print out the PDF file, file the solution page and make copies of the Challenge page to hand out to your students.
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 Wild Ribbon... Judy and Dan are the first to try out the new Wild Ribbon ride at the amusement park. Traveling at the same speed, will the two cars ever collide? Download Puzzle (179 KB)  |  Download Solution (181 KB)
 Crash Course... The Tucker boys, Jack and Dave, release identical steel balls down their respective tracks at exactly the same time. Jack's track is straight, while Dave's is cycloidal in shape. Will the balls hit their targets at the same time, or will one of them hit the target first? If the latter, which ball? Download Puzzle (64 KB)  |  Download Solution (62 KB)
 Last Waffle... Betty has a problem, for the last waffle came out of the press as shown, and the twins ALWAYS insist that their waffles each have the same shape. Can you help Betty and show her how to cut the waffle to get two identical pieces? (Note: the twins can't tell the difference between a knife cut and the baked outside of a waffle.) Download Puzzle (192 KB)  |  Download Solution (115 KB)
 Hamster Walker... Bruce has just assembled the latest exercise device for his hamster. He lost the instructions, but is pretty sure that this is the right way to set the belts. The hamster is about to start its aerobics... will the belts turn freely or not? Download Puzzle (60 KB)  |  Download Solution (85 KB)
 Blue Painted Cube... When the monument is finished it will be an enormous cube, painted blue on the outside walls but left unadorned on all inner surfaces. How many of the remaining stones needed to complete the monument will be painted blue on two sides? Download Puzzle (277 KB)  |  Download Solution (106 KB)
 Swordplay... With the look of a wild man, Captain Willy leaped into the enemy vessel. The crew scattered as the notorious captain drew his most feared serpentine blade from its scabbard... What's wrong with this picture? Download Puzzle (42 KB)  |  Download Solution (27 KB)
 Moonshine... "It was nearly midnight, and the full moon was just rising over the ocean. He held her hand, gazed deeply into her eyes, and whispered..." What is wrong with this statement? Download Puzzle (62 KB)  |  Download Solution (67 KB)
 Convention Chortle... Hilda D. Rosen, Earl Wade, and Roy Kewn had a big laugh at the convention when they realized that the letters of their names, when rearranged, spelled out the names of each of their home States. From what State does each of these delegates hail? Download Puzzle (209 KB)  |  Download Solution (112 KB)
 Hamster Walker... Bruce has just assembled the latest exercise device for his hamster. He lost the instructions, but is pretty sure that this is the right way to set the belts. The hamster is about to start its aerobics... will the belts turn freely or not? Download Puzzle (60 KB)  |  Download Solution (85 KB)
 Stick Pile Up... Counting from the top of the pile down, what animal head is on the tenth stick? Download Puzzle (186 KB)  |  Download Solution (117 KB)
 Overweight Jars... Lauren has just unpacked her shipment of colored cosmetic jars, one dozen each of red, orange, yellow, green and blue jars. Each color jar is packed in its own box. All the jars should have weighed three ounces, but the packing slip noted that each jar in one of the boxes actually weighs 3.1 ounces. Luckily, Lauren owns a spring scale accurate to one tenth of an ounce. What is the minimum number of weighings that Lauren must make to discover the color of the overweight jars? Download Puzzle (50 KB)  |  Download Solution (37 KB)
 Chow Time... The pups dug into dinner. Polaris ate more than Sirius; Castor ate less than Pollux; Pollux ate less than Sirius but more than Rigel. Which pup ate the second most? Download Puzzle (68 KB)  |  Download Solution (57 KB)
 Ball Maze... Assuming that all three colored balls will roll freely through this maze, what is the color of the ball that will exit from chute number two? Download Puzzle (210 KB)  |  Download Solution (179 KB)
 Shattered Tooth... Tony has broken a tooth at the local crab house. Looking in a hand mirror, which of the four reflections illustrated is the one he will see? Download Puzzle (63 KB)  |  Download Solution (63 KB)
 To the Top... Professor Pith Bugby is looking for the highest spot on this ancient Aztec ruin. If all the stair steps (both up and down) are the same height, can you help him find it? Download Puzzle (333 KB)  |  Download Solution (262 KB)
 Mall Madness... Kimberly headed to the mall with \$60. If she spends 1/4 of her money on clothes, \$30 on CD's and 10% of her original money pigging out at the food court, how much cash will she have left? Download Puzzle (77 KB)  |  Download Solution (58 KB)
 Snake Stretch... Professor Pith Bugby, his fearless pooch Vilmer, and Professor Motu have subdued a mighty python. As Pith holds the head, Vilmer is given the command to pull the tail and stretch out the snake for measuring. Assuming that the snake cooperates fully in this endeavor, will there be any problems with taking an accurate measurement? Download Puzzle (82 KB)  |  Download Solution (70 KB)
 Red Painted Cube... The Pharaoh has ordered that a Cube Tomb should be built from 27 smaller cubes. He has ordered that the entire outside surface of the cube (including the bottom) be painted red. When the tomb is complete how many of the smaller cubes will be painted red on two sides only? Download Puzzle (39 KB)  |  Download Solution (27 KB)
 Seating Trouble... At the wedding reception, the five guests don't know how to arrange themselves at the dinner table. They ask the bride's mother, who responds, "As I remember, Colin isn't next to Kate, Emily isn't next to Fred or Kate. Kate isn't next to Irene; neither is Emily, and Fred should sit on Irene's left." As you look at them the opposite side of the table, can you correctly seat the guests from left to right? Download Puzzle (82 KB)  |  Download Solution (57 KB)
 Big Family... Chad and Blossom (brother and sister) come from a large family. Chad has many brothers as he has sisters, but Blossom has only half as many sisters as she has brothers. How many brothers and sisters total are in the family? Download Puzzle (66 KB)  |  Download Solution (62 KB)
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 Last Updated: November 19, 2010 top
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