Division
Mental mathLogicFree
Division without remainders, with worked solutions and a multiplication check. Great for patching gaps in times tables.
How to play: Solve division problems with no remainder. Enter your answer using the number pad and tap Check. Each answer is followed by the solution and a multiplication check. Move to the next problem when you are ready. Settings: division facts, larger numbers, or a two-digit divisor; 5 to 30 problems. Your score is the percentage of correct answers. A list of solutions appears at the end.
Solve Problems
Mental mathProcessing speedFree
Speed sums with a penalty for mistakes: teaches you to calculate fast without getting sloppy.
How to play: Solve math problems as fast as you can. Faster solving = more points. Wrong answer = +1 second penalty.
Flash Count
Mental mathWorking memory
The problem is visible for one second, so you solve it from memory. Mental math and working memory in one.
How to play: A math problem appears for 1 second, then disappears. Enter the answer from memory.
Jumping Math
Mental mathWorking memoryPeripheral vision
Numbers pop up in different places and you add them up. Arithmetic, attention and memory at once.
How to play: Numbers appear on screen in random places. Remember them and enter the sum of all numbers. You can choose the number of digits and disappearance speed in settings.
Percent Guess
Estimation
Judge by eye how full the bar is. Builds a sense of proportion.
How to play: A filled bar is shown on screen. Guess what percentage it is filled. Enter your answer as a percentage.
Percentages
Mental mathEstimation
Quickly work out percentages of a number: discounts, tips and taxes in your head without a calculator.
How to play: A number and percentage appear on screen. Calculate the result and enter it. The faster, the better.
Guess the Angle
EstimationSpatial skills
Guess the size of an angle in degrees. Trains geometric intuition and a good eye.
How to play: An angle is drawn on screen. Choose the correct value in degrees from 4 options. Trains geometric intuition.
Mental mathWorking memoryAttention
“Count down from 100 by sevens” — a well-known neuropsychological task for concentration and mental arithmetic.
How to play: Start from 100 and repeatedly subtract 7. Enter the next result. Focus on accuracy and speed.
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Mix Colors
EstimationLogic
Mix red, green and blue to match a sample colour. Colour intuition and step-by-step adjustment.
How to play: You are given a target color at the top. Mix red, green, and blue to get the same color!
PrecisionHand–eye coordinationSpatial skills
Draw a circle freehand and get a score in percent. A simple, addictive test of motor control.
How to play: Draw a circle freehand. We estimate similarity to a perfect circle in percent. Attempts can be configured in settings.
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Fifteen Puzzle
PlanningLogicSpatial skills
The 15 puzzle: put the tiles in order by sliding them. Planning several moves ahead.
How to play: Arrange the numbers in order by sliding tiles.
Mix
PlanningLogic
Sort the balls by colour across cups. A puzzle about sequencing moves.
How to play: Sort balls by colors by moving the top ball between cups. At the end every cup should contain balls of a single color.
Equations
LogicMental math
Equations with shapes: work out the value of each shape from the hints, then solve the final one. Algebra without x.
How to play: Solve equations with shapes. First determine the value of each shape from the hints, then solve the final equation.
LogicPlanningAttention
Classic 9×9 sudoku with adjustable difficulty. Pure logic, no arithmetic.
How to play: Fill a 9×9 grid with numbers 1–9 so that each row, column and 3×3 box contains all digits without repeats. Difficulty is configurable in settings.
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Sequence
LogicMental math
Find the pattern in a series of numbers and fill the gap. Inductive reasoning, as in IQ tests.
How to play: Find the pattern in the number sequence and guess the missing number.
Choose the Correct Sign
Mental mathLogic
Choose the sign (+, −, ×, ÷) that makes the equation true. Working backwards builds flexible number sense.
How to play: Three numbers are shown: a ? b = c. Choose the sign (+, -, ×, ÷) that makes the expression true.
Number Scales
Mental mathLogic
Balance the scales with the right number — addition and difference made visual.
How to play: Numbers are placed on scales. Choose the number to add to the right side to balance the scales.
PlanningLogicWorking memory
The Tower of Hanoi: move the disks without placing a larger one on a smaller one. A classic planning puzzle.
How to play: Move all disks from the first peg to the last. You cannot place a larger disk on a smaller one. Fewer moves = better.
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Magic Square
LogicMental math
Place numbers in a 3×3 grid so every row, column and diagonal adds up to 15.
How to play: Fill the 3×3 grid so every row, column and diagonal sums to 15.
Fermi Estimation
EstimationLogic
Estimate the order of magnitude in a real-life question. Teaches you to reason when exact data is missing.
How to play: Estimate the order of magnitude in a real-world question. Pick the closest option from 4. Trains estimation thinking.
Shape Math
Spatial skillsLogic
Add and subtract shapes as sets of lines and draw the result. Spatial reasoning.
How to play: Shapes add and subtract as sets of lines: plus merges lines and minus removes them. Choose 2, 3, or 4 shapes per expression in settings. Draw the resulting shape with your finger along the guide dots.
Mental mathVisual memoryWorking memory
Mental arithmetic on the soroban, the Japanese abacus. You set the answer with beads; difficulty adds digits.
How to play: Solve the expression and set the answer on the soroban. The upper bead on each rod is worth 5 and each lower bead is worth 1. Move beads toward the center beam. Medium and hard levels use addition and subtraction chains.
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Greater or Less
Mental mathProcessing speedEstimation
Two expressions — which is bigger? Quick estimating and calculating; the higher the level, the closer the results.
How to play: Two expressions appear at once: 7 × 8 and 60 − 7. Tap the one with the bigger result, as fast as you can. There are never ties — one of them is always bigger. The higher the difficulty, the harder the operations and the closer the two results get. Settings: number of attempts and difficulty.
Quick Math
Mental mathWorking memory
Numbers and operations appear one by one, so you hold the running total in your head to the end of the chain.
How to play: Numbers and operations appear one at a time. Apply each operation in order, from left to right, and enter the final result. Division has no remainder. Settings: attempts, pause, number count, difficulty, and operations (+, −, ×, ÷).
