Number sequences

Look at the gaps between numbers, multiplication, or two interleaved sequences. Choose the answer that follows the simplest consistent rule among the choices. A short sequence can have other mathematical continuations; the explanation shows the intended rule.

Select one of four answers, then choose Check answer. You can change your selection before checking. Read the explanation and continue when ready. Keyboard: Tab to the answers and use the arrow keys to change your choice.

Solving time excludes setup, explanations and background tabs. The optional challenge gives you two minutes of solving time across six questions. When time runs out, unanswered questions count as incorrect. Timed and untimed results stay separate.

A new round needs an internet connection. Once loaded, all six questions work on your device. Completed rounds and timed-out challenges are saved; ending early is not saved. Your individual answers are not uploaded.

These are original reasoning puzzles for practice, not a validated IQ test. Results describe this activity, not your intelligence.