Each round generates 6, 12 or 18 questions from 63 templates with changing numbers, shapes and solutions. The last three rounds help avoid repeats while the page is open, and on later visits if you allow storage. Resuming keeps the same questions.

Practice mode offers hints and immediate feedback; checking an answer locks it. Challenge mode reveals solutions at the end and lets you change answers until then. Difficulty levels are training categories, not scientific ratings.

This is a thinking challenge for practice and enjoyment, not a standardised IQ test or professional assessment. Your score reflects only correct answers in this round. It does not measure intelligence, provide a percentile or compare you with a population.

For teenagers and adults who can read the selected language and know basic arithmetic. The challenge is for practice and enjoyment, not for assessing children’s abilities.

At launch, practice, results and explanations are free. No card is required and there is no recurring subscription. Paid practice packs may be added later, with clear prices and terms before purchase.

No. The elapsed time is shown, but there is no time limit or speed bonus. Skip and return as needed. In practice mode, checked answers are locked; in challenge mode you can change them until finishing.

Progress and up to 20 summaries are saved for later visits only with your permission and if your browser allows it. Otherwise they stay in the open page only. Practice answers are not sent to the server. You can delete practice data in the footer; sharing is your choice.