PuzzleLog

Puzzles

Algebra Too

Bat and Ball Two Runners Belt Around the Earth Odd Run of Heads Hopping and Skipping Area–Perimeter Match Three Negatives Red and Black Sides Recovering the Polynomial Gaming the Quilt Strength of Schedule Two Round-robins Alternative Dice

Working for the System

No Twins Today Martians in a Circle Poker Quickie Fewest Slopes Two Different Distances First Odd Number Measuring with Fuses King’s Salary Packing Slashes Unbroken Lines Unbroken Curves Conway’s Immobilizer Seven Cities of Gold

Back from the Future

Portrait Three-Way Duel Testing Ostrich Eggs Pancake Stacks Chinese Nim Turning the Die Game of Desperation Deterministic Poker Bluffing with Reals Swedish Lottery Pegs on the Corners Touring an Island Fibonacci Multiples Light Bulbs in a Circle Emptying a Bucket Ice Cream Cake Moth’s Tour Boardroom Reduction

Out for the Count

Half Grown Powers of Two Watermelons Bags of Marbles Salaries and Raises Efficient Pizza-cutting Attention Paraskevidekatriaphobes Meet the Williams Sisters Rating the Horses Shoelaces at the Airport Rows and Columns Three-Way Election Sequencing the Digits Faulty Combination Lock Losing at Dice Splitting the Stacks North by Northwest Early Commuter Alternate Connection Bindweed and Honeysuckle

The Pigeonhole Principle

Shoes, Socks, and Gloves Polyhedron Faces Lines Through a Grid Same Sum Subsets Lattice Points and Line Segments Adding, Multiplying, and Grouping Line Up by Height Ascending and Descending Zeroes and Ones Same Sum Dice Zero-sum Vectors

Hammer and Tongs

Phone Call Crossing the River Sprinklers in a Field Fair Play Finding the Missing Number Identifying the Majority Poorly Placed Dominoes Unbreakable Domino Cover Filling a Bucket Polygon on the Grid One-bulb Room Sums and Differences Prisoner and Dog Love in Kleptopia Badly Designed Clock Worms and Water Generating the Rationals Funny Dice Sharing a Pizza Names in Boxes Life-saving Transposition Self-referential Number

Let's Get Physical

Rotating Coin Pie in the Sky Pushing the Pedal Returning Pool Shot Falling Ants Ants on the Circle Sphere and Quadrilateral Two Balls and a Wall

Intermediate Math

Boxing the Mountain State Monk on a Mountain Cutting the Necklace Three Sticks Hazards of Electronic Coinflipping Bugs on a Pyramid Skipping a Number Splitting a Polygon Garnering Fruit

In All Probability

Winning at Wimbledon Birthday Match Other Side of the Coin Boy Born on Tuesday Whose Bullet?Second Ace Points on a Circle Comparing Numbers, Version I Comparing Numbers, Version II Biased Betting Home-field Advantage Service Options Who Won the Series?Dishwashing Game Random Judge Wins in a Row Split Games Angry Baseball Two-point Conversion Random Chord Random Bias Coin Testing Coin Game Sleeping Beauty Leading All the Way

Information, Please

Finding the Counterfeit Three Martians at the Crossroads Attic Lamp Players and Winners Missing Card Peek Advantage Bias Test Dot-town Exodus Conversation on a Bus Matching Coins Two Sheriffs

Unlimited Potentials

Signs in an Array Righting the Pancakes Breaking a Chocolate Bar Red Points and Blue Bacteria on the Plane Pegs on the Half-plane Pegs in a Square First-grade Division Infected Checkerboard Impressionable Thinkers Frames on a Chessboard Bugs on a Polyhedron Bugs on a Line Flipping the Pentagon Picking the Athletic Committee Bulgarian Solitaire

Seeing Is Believing

Meeting the Ferry Mathematical Bookworm Rolling Pencil Splitting a Hexagon Circular Shadows I Trapped in Thickland Polygon Midpoints Not Burning Brownies Protecting the Statue Gluing Pyramids Precarious Picture Finding the Rectangles Tiling a Polygon Tiling with Crosses Cube Magic Circles in Space Invisible Corners

Startling Transformation

Sinking 15 Slicing the Cube Expecting the Worst Next Card Red Magnetic Dollars Integral Rectangles Laser Gun Random Intervals Infected Cubes Gladiators, Version I Gladiators, Version II More Magnetic Dollars

Graphography

Air Routes in Aerostan Spiders on a Cube Handshakes at a Party Snake Game Bracing the Grid Competing for Programmers Wires under the Hudson Two Monks on a Mountain Worst Route

Weighs and Means

Tipping the Scales Men with Sisters Watches on the Table Raising Art Value Waiting for Heads Finding a Jack Sums of Two Squares Increasing Routes

The Power of Negative Thinking

Chomp Dots and Boxes Variation Big Pairs in a Matrix Bugging a Disk Pairs at Maximum Distance Lemming on a Chessboard Curve on a Sphere Soldiers in a Field Alternating Powers Halfway Points

Great Expectation

Bidding in the Dark Rolling All the Numbers Spaghetti Loops Ping-pong Progression Drawing Socks Random Intersection Roulette for the Unwary An Attractive Game Next Card Bet Serious Candidates Rolling a Six Napkins in a Random Setting Roulette for Parking Money Buffon’s Needle Covering the Stains Colors and Distances Painting the Fence Filling the Cup

Journey into Space

Easy Cake Division Painting the Cubes Curves on Potatoes Painting the Polyhedron Boarding the Manhole Slabs in 3-Space Bugs on Four Lines Circular Shadows II Box in a Box Angles in Space Curve and Three Shadows

Achieving Parity

Bacterial Reproduction Fourth Corner Unanimous Hats Half-right Hats Red and Blue Hats in a Line Prisoners and Gloves Even-sum Billiards Chameleons Missing Digit Subtracting Around the Corner Uniting the Loops

Safety in Numbers

Broken ATM Subsets with Constraints Cards from Their Sum Divisibility Game Prime Test Numbers on Foreheads Rectangles Tall and Wide Locker Doors Factorial Coincidence Even Split Factorials and Squares

The Law of Small Numbers

Domino Task Spinning Switches Candles on a Cake Lost Boarding Pass Flying Saucers Gasoline Crisis Coins on the Table Coins in a Row Powers of Roots Coconut Classic

Brilliant Induction

Uniform Unit Distances Swapping Executives Odd Light Flips Truly Even Split Nonrepeating String Baby Frog Guarding the Gallery Path Through the Cells Profit and Loss Uniformity at the Bakery Summing Fractions Tiling with L’s Traveling Salesmen Lame Rook

Nimbers and the Hamming Code

Life Is a Bowl of Cherries Life Isn’t a Bowl of Cherries?Whim-Nim Option Hats Chessboard Guess Majority Hats Fifteen Bits and a Spy

Infinite Choice

Hats and Infinity All Right or All Wrong Double Cover by Lines Wild Guess Exponent upon Exponent Find the Robot Figure Eights in the Plane Y’s in the Plane

#217

Figure Eights in the Plane