Brain Teasers

Brain teasers

Mini Sudoku

A 4×4 grid needing every digit once per row and column.

Medium Brain teasers

Kakurasu Grid

Light cells to hit every row and column sum.

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Symbol Pattern

Shapes swap positions to keep balance.

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Hourglass Pulse

Sand keeps time better than a watch when thought through.

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Lighthouse Signal

Light tells stories to sailors if you count the pauses.

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Train Signal

Speeds and distances answer the question without a single number.

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Color Sequence

Spot the rule guiding every new shade.

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Letter Lock

Letters hide the code to the next vault.

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River Crossing

Missionaries must keep pace with the cannibals.

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Water Jug Challenge

Measure exactly with imprecise tools.

Medium Brain teasers

Clock Angle

How many degrees separate the hands?

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Birthday Paradox

Fewer people than you think creates a collision.

Expert Brain teasers

Rope Burn Timer

Measure time with inconsistent fuses.

Medium Brain teasers

Handshake Count

Every pair shakes once—how many total?

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Sum to Hundred

Insert operators between digits.

Expert Brain teasers

Missing Dollar

Where did the dollar go?

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Pirates' Gold

Democratic pirates divide the treasure.

Expert Brain teasers

Chessboard Grains

Exponential growth surprises the king.

Hard Brain teasers

Lily Pad Pond

Exponential growth catches you by surprise.

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Witch's Brew

Three ingredients, specific proportions.

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Counting Ghosts

How many spirits haunt the mansion?

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Santa's Route

Visiting houses in optimal order.

Hard Brain teasers

Ornament Pattern

Find the missing ornament count.

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Light Speed Travel

How long to reach the sun?

Easy Brain teasers

DNA Base Pairs

Complete the sequence.

Easy Brain teasers

Chemical Equation

Balance the reaction.

Medium