Grid puzzles and planning problems solved by reasoning, not calculation speed.
Other topics:
Arithmetic Games Fractions & Percentages Logic & Puzzle Games Number Theory Games Speed & Reflex Games Rare & Unusual Maths
Three blanks to fill
Six blanks, much less to go on
The Dürer square
Ten blanks on a sixteen-cell grid
Seven moves if you are perfect
Fifteen moves, the classic
Thirty-one moves
Sixty-three moves, for the patient
Nine cells, a friendly start
The standard puzzle
Twenty-five cells
The full-size challenge
Find the hidden number using higher-or-lower clues.
Slide and merge tiles to reach 2048.
The classic nine-by-nine logic puzzle.
Work out the rule and continue the sequence.
Combine numbers to clear the board.
Every game on YogiCalc is free, runs entirely in your browser, needs no sign-up and saves your best score on your own device. Nothing is uploaded anywhere. They work on a phone, a tablet or a computer.
Looking for something else? The full games library lists all 110 games, and the calculator library covers finance, tax, health and conversion.