Riddle lounge
Wordplay, lateral clues, and quick reframes that reward a clever turn of phrase.
Riddle lounge
Short twists, big surprises
You'll find quick but clever questions that rely on wordplay, clues, and lateral thinking.
View all 202 Riddles →The Cabin Puzzle
Two people stand on opposite sides of a wide river. There is no bridge, and they have no boat, yet they manage to cross without getting wet or using a rope. How?
Hint: Winter freezes the river, so crossing needs no bridge.
Silent Guest
A guest in a dark room can’t see anything, yet they read an entire book. How did they do it?
Hint: Sometimes reading requires two senses.
Numbers in Line
Using the digits 1, 2, 3, and 4 just once each, insert operations to create an equation that equals 10.
Hint: Group digits with parentheses before multiplying.
Logic lab
Game-style reasoning
Play with constraints, try deduction, and tease apart cause and effect.
View all 206 Logic Puzzles →Island of Knights
All knights always tell the truth, and knaves always lie. A visitor asks three islanders, "Is one of you a knight?" The first says "Yes," the second says "No," and the third says "Yes." Who is who?
Strategy: Test each statement assuming different roles.
Light Switches
There are three switches outside a room. Only one lights a bulb inside. You may flip switches freely, but you can enter the room only once. How do you identify the correct switch?
Strategy: Use heat, not just sight.
Ordering Guards
Four guards stand in a line. Each guard either always speaks or always stays silent. Given a series of statements, deduce which guard is silent and which speaks without contradicting the statements.
Strategy: Start with the most restrictive statement first.
Sudoku Corner
Number placement puzzles
From mini 4×4 grids to classic 9×9 boards and exotic variants—explore every style of Sudoku.
Puzzle Hub
Classic logic puzzles
From picture puzzles and math crosswords to mine-sweeping adventures—challenge yourself with our collection of timeless brain teasers.
Themed Collections
Seasonal & Special Puzzles
Explore curated puzzle collections organized by theme—from Halloween spooks to Christmas cheer and science discoveries!
Fresh arrivals
Just-added puzzles
Each link opens its own page with question, hint, and answer so you can savor one challenge at a time.
Mirror Keepers
Logic lab · Truth and lies both point you toward safety.
Hint: Make the liar describe the truth-teller.
Hourglass Pulse
Brain teasers · Sand keeps time better than a watch when thought through.
Hint: Track each flip when a glass empties.
Weight Balance
Logic lab · Find the odd coin with just two weighings.
Hint: Divide coins into threes before each weighing.
Desert Map
Riddle lounge · Towns, mountains, and rivers exist without the real things.
Hint: Fold it, and every legend remains true.
Lighthouse Signal
Brain teasers · Light tells stories to sailors if you count the pauses.
Hint: Long flash equals dash, short equals dot.
Echo Canyon
Riddle lounge · The third voice claims to be the first.
Hint: An echo keeps repeating.
Train Signal
Brain teasers · Speeds and distances answer the question without a single number.
Hint: Close the gap using speed ratios.
Secret Path
Logic lab · Only the least traveled way keeps you safe.
Hint: Choose the path that names safety.
Color Sequence
Brain teasers · Spot the rule guiding every new shade.
Hint: Divide the position by 3.
Clock Hands
Logic lab · Align both hands with minimal adjustment.
Hint: Use the 65/11-minute overlap each hour.
Letter Lock
Brain teasers · Letters hide the code to the next vault.
Hint: Index letters carefully.
Forest Echo
Riddle lounge · Answer returns exactly once after you speak.
Hint: The echo shouts back your own words.
Midnight Ferry
Riddle lounge · The ferry only sails when the minutes add up.
Hint: Send the lantern with the fastest pair again.
Staircase Logic
Logic lab · One guard slips while the others have clean records.
Hint: Exactly one liar keeps the pattern balanced.
River Crossing
Brain teasers · Missionaries must keep pace with the cannibals.
Hint: Ferry two cannibals at the start.
Category map
Choose the kind of puzzle you crave
Riddle lounge leans on language and lateral thinking, brain teasers focus on patterns and numbers, and the logic lab collects multi-step deduction challenges.
Brain teasers
Number workouts, patterned puzzles, and visual-grid logic that keep your focus on steps and sums.
Logic lab
Constraint systems, truth-teller mysteries, and multi-step deductions that demand careful reasoning.
Featured play
Visit the Sudoku playground
A full JavaScript Sudoku suite offers 4×4, 6×6, and 9×9 boards with validation and level choices.
Open the Sudoku playgroundCatalog
Browse every puzzle
The catalog lists every puzzle we’ve created so far, including the latest batch of 50. Jump straight to the full grid and pick whichever challenge looks fun.
Explore the catalog