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Problems unlock one after another, from simple all the way to genius. Every one you solve adds XP.

  • 1,198 problems
  • 9 difficulty levels
  • +5 to +405 XP per problem
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All problems

Showing 145–192 of 1,198

  • 1.145Equations

    Locked

    Father and son

    Difficulty 1 of 9+5 XP

  • 1.146Geometry

    Locked

    Clock hands at 3:40

    Difficulty 1 of 9+5 XP

  • 1.147Geometry

    Locked

    Painting a box

    Difficulty 1 of 9+5 XP

  • 1.148Arithmetic

    Locked

    Children at a camp

    Difficulty 1 of 9+5 XP

  • 1.149Fractions

    Locked

    Who plays football

    Difficulty 1 of 9+5 XP

  • 1.150Equations

    Locked

    Thirds and quarters in an equation

    Difficulty 1 of 9+5 XP

  • 1.151Geometry

    Locked

    Where the angle bisectors meet

    Difficulty 1 of 9+5 XP

  • 1.152Arithmetic

    Locked

    Digit sum twelve

    Difficulty 1 of 9+5 XP

  • 1.153Fractions

    Locked

    Three brothers and two ratios

    Difficulty 1 of 9+5 XP

  • 1.154Equations

    Locked

    Coins in a piggy bank

    Difficulty 1 of 9+5 XP

  • 1.155Geometry

    Locked

    Seeds for a lawn

    Difficulty 1 of 9+5 XP

  • 1.156Arithmetic

    Locked

    Football boots in two shops

    Difficulty 1 of 9+5 XP

  • 1.157Fractions

    Locked

    Too sweet a raspberry drink

    Difficulty 1 of 9+5 XP

  • 1.158Algebra

    Locked

    Two rows of squares

    Difficulty 1 of 9+5 XP

  • 1.159Geometry

    Locked

    A stone in the aquarium

    Difficulty 1 of 9+5 XP

  • 1.160Logic

    Locked

    Who ate the cake

    Difficulty 1 of 9+5 XP

  • 1.161Fractions

    Locked

    Mowing a meadow

    Difficulty 1 of 9+5 XP

  • 1.162Equations

    Locked

    Four numbers in a row

    Difficulty 1 of 9+5 XP

  • 1.163Geometry

    Locked

    A triangle inside a square

    Difficulty 1 of 9+5 XP

  • 1.164Arithmetic

    Locked

    A walker and a cyclist

    Difficulty 1 of 9+5 XP

  • 1.165Fractions

    Locked

    A tank with a drain

    Difficulty 1 of 9+5 XP

  • 1.166Equations

    Locked

    Sharing sweets among siblings

    Difficulty 1 of 9+5 XP

  • 1.167Geometry

    Locked

    A painted cuboid cut into cubes

    Difficulty 1 of 9+5 XP

  • 1.168Arithmetic

    Locked

    Training on a Sunday

    Difficulty 1 of 9+5 XP

  • 1.169Fractions

    Locked

    Eggs at the market

    Difficulty 1 of 9+5 XP

  • 1.170Algebra

    Locked

    An expression in two variables

    Difficulty 1 of 9+5 XP

  • 1.171Geometry

    Locked

    A staircase net

    Difficulty 1 of 9+5 XP

  • 1.172Equations

    Locked

    A garden of unknown width

    Difficulty 1 of 9+5 XP

  • 1.173Logic

    Locked

    Points from a tournament

    Difficulty 1 of 9+5 XP

  • 1.174Fractions

    Locked

    Marbles and a new ratio

    Difficulty 1 of 9+5 XP

  • 1.175Equations

    Locked

    Grandma’s bowl

    Difficulty 1 of 9+5 XP

  • 1.176Geometry

    Locked

    Four rectangles in one

    Difficulty 1 of 9+5 XP

  • 1.177Arithmetic

    Locked

    A train, a pole and a bridge

    Difficulty 1 of 9+5 XP

  • 1.178Fractions

    Locked

    Three thirds of a route

    Difficulty 1 of 9+5 XP

  • 1.179Equations

    Locked

    Three kinds of coins

    Difficulty 1 of 9+5 XP

  • 1.180Geometry

    Locked

    A cuboid from three faces

    Difficulty 1 of 9+5 XP

  • 1.181Arithmetic

    Locked

    Remainders one less

    Difficulty 1 of 9+5 XP

  • 1.182Fractions

    Locked

    Two candles

    Difficulty 1 of 9+5 XP

  • 1.183Equations

    Locked

    A melon on the scales

    Difficulty 1 of 9+5 XP

  • 1.184Geometry

    Locked

    Rectangles on squared paper

    Difficulty 1 of 9+5 XP

  • 1.185Arithmetic

    Locked

    Digit product twelve

    Difficulty 1 of 9+5 XP

  • 1.186Fractions

    Locked

    A sum of nineteen fractions

    Difficulty 1 of 9+5 XP

  • 1.187Equations

    Locked

    When will Mum be twice as old

    Difficulty 1 of 9+5 XP

  • 1.188Geometry

    Locked

    A cube with tunnels

    Difficulty 1 of 9+5 XP

  • 1.189Logic

    Locked

    Knights and liars at a table

    Difficulty 1 of 9+5 XP

  • 1.190Fractions

    Locked

    Fractions with denominator 36

    Difficulty 1 of 9+5 XP

  • 1.191Algebra

    Locked

    A triangle of little triangles

    Difficulty 1 of 9+5 XP

  • 1.192Geometry

    Locked

    The hands meet

    Difficulty 1 of 9+5 XP