Guides
Plain-English guides to how IQ tests work, written to be accurate rather than flattering. Each one names the research and the standard tests it draws on.
The puzzles in IQ tests, explainedPattern grids, number sequences, mental rotation, paper folding, verbal reasoning and memory span, with examples to try.
What IQ scores meanThe bell curve, percentiles, why every score needs a range, and what an online test can and can't tell you.
Can you improve your IQ score?What practice, brain training, education and test conditions really change, and strategies for each puzzle type.