Memorise the positions of the numbered squares, then click them in order once they vanish — a classic working-memory test that runs entirely in your browser.
Chimp Test
Memorise the positions of the numbered squares, then click them in order once they vanish — a classic working-memory test that runs entirely in your browser.
The Chimp Test runs entirely in your browser. Board positions are generated on your device and your best score is stored locally; nothing is uploaded.
The Chimp Test starts with four numbered squares scattered over a grid. Click the square marked 1 and the others turn blank; you then have to click the rest in ascending order from memory. Clear the board and the next one holds one more number, until the 40 squares of the grid are full. Three wrong squares end the game, and the page records the largest board you cleared as your score. Classic mode hides the numbers the moment you click 1, while Timed memorise shows them for a few seconds — longer as the board grows — and then blanks them for you. The board is 8 by 5 on desktop and stands upright as 5 by 8 on a phone, so every square stays easy to tap. Positions come from the browser's secure random generator, your best score stays in this browser, and nothing is uploaded.
Features
Starts at four numbers and adds one for every board you clear, up to a completely full 40-square grid
Classic mode blanks the board after your first click; Timed memorise hides it after a countdown bar
Three strikes per game, with a fresh board dealt after each wrong square
Random positions that never overlap, drawn from the browser's secure random generator
8 by 5 board on desktop, 5 by 8 on phones so squares stay finger-sized
Personal best and the last ten games saved only in this browser
One-click copy of a shareable result line
Fully playable from the keyboard with Tab, Enter and Space
How to use the Chimp Test
Choose Classic or Timed memorise and press Start
Study the numbered squares, then click 1 (Classic) or wait for the bar to run out (Timed)
Click the blank squares in ascending order from memory
Clear the board to move up one number; three wrong squares end the game
Check your result, copy it, and press Play again to beat your best
Your score is the biggest board you finished, not the one you failed on.
Common errors & troubleshooting
The numbers disappeared before I could memorise them. — In Classic mode they blank as soon as you click 1, so study the whole board first. Switch to Timed memorise if you prefer a countdown that gives you a fixed window.
A wrong click redealt the board instead of ending the game. — A wrong square is one strike, and a new board with the same number of squares is dealt. The game only ends on the third strike.
Clicking an empty space does nothing. — Only squares that still hold a number are clickable. Squares you have already cleared vanish, and gaps never count as mistakes.
My best score is gone. — Scores are stored in this browser only. Clearing site data, using a private window or switching browsers starts a fresh record.
Frequently asked questions
What is the chimp test and what does it measure?
It is a short working-memory task: you glimpse numbers at scattered positions, then reproduce their order from memory. It rewards fast spatial memory rather than general intelligence, and the score here is meant as a fun benchmark, not a clinical result.
How is the Chimp Test score calculated?
The score is the largest board you cleared completely. If you clear the four-number board and fail on five, your score is four. Three strikes end the game, and you also see the board you ended on and how many strikes you used.
What is the difference between Classic and Timed memorise mode?
Classic hides every number the instant you click square 1, so the speed of your memorising is up to you. Timed memorise leaves the numbers visible for a fixed window that lengthens with each board, then blanks them automatically.
How many numbers can the chimp test go up to?
The grid has 40 squares, so a perfect game ends on a board with all 40 numbers. Most people stall somewhere between six and ten, and reaching the low twenties takes real practice.
Are the square positions in the Chimp Test really random?
Yes. Each board is drawn with the browser's secure random generator, with no two numbers sharing a square, so you cannot learn a fixed pattern from game to game.
Does the chimp test work well on a phone?
It does. On narrow screens the board is turned upright into five columns by eight rows, giving each square a bigger tap target. Everything runs locally, so no network is needed once the page has loaded.
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