Memory Tests

The number memory test measures your digit span — the number of digits you can hold in short-term memory at once. A number flashes on screen, disappears, and you type it back.

The visual memory test measures how much visual-spatial information you can hold at once. A grid appears, some squares flash white for a moment, and you have to click exactly those squares from memory.

The chimp test is based on a famous experiment in which young chimpanzees outperformed humans at remembering the position of numbers flashed on a screen. Numbers appear scattered on a grid, then turn into blank tiles — your job is to tap them in order, 1, 2, 3 and so on, entirely from memory.

The verbal memory test measures how many words you can keep track of in memory at once. Words appear one at a time.

The Schulte Table is a deceptively simple grid: the numbers 1 to 25, scrambled. Your job is to tap them in order as fast as possible.

The Stroop test is one of the most famous experiments in psychology. The word "RED" appears written in blue ink — and naming the ink colour while ignoring the word is surprisingly hard, because your brain reads automatically before it does anything else.

How fast are your reflexes, in milliseconds? Wait for the red panel to turn green, then click as fast as humanly possible. We run five rounds and average them, because single trials are noisy.

The backwards digit span is the tougher sibling of the number memory test. A number flashes on screen — but instead of typing it back, you type it in reverse.

The N-Back is the most researched brain-training task in cognitive science. Squares light up one after another on a grid, and your job is to press MATCH whenever the current position is the same as it was exactly two steps ago.

The aim trainer measures how quickly and accurately you can click a moving target — the same hand-eye coordination skill that FPS gamers drill before ranked play. A small circular target appears at a random spot on the board; click it and the next one appears immediately.

The typing test measures your typing speed in words per minute (WPM) and how accurately you type under time pressure. A stream of common English words appears; type each one and press space to move to the next.

Sudoku is the world's most popular logic puzzle: a 9×9 grid split into nine 3×3 boxes, partly filled with clues. Your task is to complete it so that every row, every column and every 3×3 box contains the digits 1 to 9 exactly once.

2048 is the addictive sliding-tile puzzle that swept the internet in 2014. You play on a 4×4 grid: every move slides all the tiles in one direction, and when two tiles with the same number collide they merge into one worth double.

Minesweeper is the classic logic game that shipped on millions of computers for decades. Hidden mines are scattered across a grid; your job is to reveal every square that is not a mine.

Nonograms — also known as Picross, Griddlers or Hanjie — are picture logic puzzles. Each row and column carries a set of numbers listing the runs of filled squares in order: a clue of "3 1" means a block of three filled cells, a gap, then a single filled cell.

Kakuro is like a crossword built from sums instead of words. The grid is split into horizontal and vertical runs of white cells, and every run carries a clue — the total its digits must add up to.

Word Guess is the five-letter deduction game everyone knows — guess the hidden word in six attempts. After each guess, every letter is colour-coded: green means it is in the word and in the right spot, yellow means it is in the word but somewhere else, and grey means it is not in the word at all.

The sliding puzzle — also called the 15 puzzle — is one of the oldest and most famous mechanical puzzles ever made. Numbered tiles sit in a grid with a single empty space; you slide tiles into that gap, one at a time, until the numbers run in order from the top-left with the gap in the corner.

Solitaire — properly Klondike, the version that shipped with Windows and taught the world to drag cards — is the most-played card game there is. You deal seven tableau piles and work through the stock to uncover cards, building four foundation piles up from Ace to King, one per suit.

Non-verbal reasoning measures how well you spot a rule in a set of shapes and apply it — without language or arithmetic getting in the way. It is the format behind 11+ non-verbal reasoning papers and the abstract or inductive reasoning sections of graduate aptitude tests.