IQ Test measures reasoning across the seven areas used by standard mixed batteries: matrices and number grids, logic and letter sequences, spatial, numerical, classification, analogies and verbal. Each sitting draws a fresh test from 424 questions in 19 formats, so no two runs match. Figure questions give six answers like real progressive matrices, and the hardest items stack several rules at once. Scored with item response theory. Free to take; the full report and certificate are $4.99.