Original IQ tests of fluid reasoning
Find out today with THETIS, the adaptive online IQ test of pure fluid reasoning: no vocabulary, no arithmetic, no prior knowledge, and your IQ with a verifiable certificate the moment you finish. Prefer a clock? Take RUFIT, the timed test. Prefer no clock at all? Take your time with PROTEUS and QUADRAVA-FR, scored personally by the author. Every problem is the original work of Jo Christopher Resquites, MEng.
New to IQ tests? Try the practice puzzles first · Compare the four tests
Four tests, one aim: to measure how well you reason when the rules are new. Take THETIS for a score today at any level, RUFIT to measure reasoning against the clock, QUADRAVA-FR as a first high-range test, and PROTEUS when you want the summit.
Everyone · online · adaptive
THETIS adapts to you as you answer: about 30 puzzles, 25 to 45 minutes, and your IQ with a certificate the moment you finish. A 14-puzzle practice module comes first.
Take THETISOnline · timed
RUFIT gives you 36 figures, one at a time, 35 or 60 seconds each. Published norms, an instant certificate, and admission to two of the societies.
Take RUFITGifted range · untimed
QUADRAVA-FR is built for about IQ 125 to 170 and makes a strong first high-range test, and a natural step before PROTEUS.
Explore QUADRAVA-FRExtreme range · untimed
PROTEUS measures precisely to about IQ 185, and its scale runs on to a nominal ceiling of 250, for the most exceptional solvers.
Explore PROTEUSOnline · adaptive · instant
Puzzles from seven families of original reasoning problems, each chosen by item response theory to measure best at your level. You get a deviation IQ with its 95% range, percentile, seven facet scores and a PDF certificate anyone can verify. US$19.99 per session, with new puzzles every time.
Start here · gifted range
Unfamiliar rules. Interacting relationships. New situations.
The summit · extreme range
Laws that hide, change and travel. Keep hold of them through every change.
Every score comes with a margin of error, and each test is most precise inside its own band. THETIS covers IQ 55 to 195 online; RUFIT's published norm runs from IQ 115 to 190; QUADRAVA-FR and PROTEUS go deepest in the high range without a clock.
| Test | Precise or normed range | Margin | Top of scale |
|---|---|---|---|
| THETIS | IQ 55–195 | about ±9 IQ points (95%) over most of the range | reporting ceiling IQ 220+ |
| RUFIT | IQ 115–169 (observed) | reliability .92 (about ±8 points, 95%) | table continues to IQ 190 |
| QUADRAVA-FR | IQ 122–173 | about 2.9 IQ points (IQ 139–156) | reporting ceiling IQ 170 |
| PROTEUS | IQ 136–184 | about 3.9 IQ points (near IQ 160) | nominal ceiling IQ 250 |
Built for one purpose: to measure fluid intelligence accurately and precisely, at every level of ability.
Every score is a deviation IQ (σ 15) with its margin of error. THETIS uses item response theory to aim each puzzle where it measures best, from below average to the far gifted range, and PROTEUS extends precise measurement to about IQ 185.
Every problem is new and abstract: no trivia, vocabulary or schooling, and no answer can be looked up. Novelty is what lets a test measure reasoning itself rather than what someone has learned.
Every THETIS and PROTEUS problem is checked by computer: under the rules given, exactly one answer follows from the simplest explanation of the evidence. In THETIS, the wrong options come from typical reasoning errors, not from tricks.
THETIS, PROTEUS and QUADRAVA-FR are power tests: how fast you answer never changes your score. THETIS gives each puzzle a generous clock (3 to 20 minutes); PROTEUS and QUADRAVA-FR are untimed. RUFIT is the speeded test, with a short clock on every question, for reasoning under time pressure.
Online tests save every answer on the server the moment you give it. A dropped connection, a reload or a closed browser never loses a test: it reconnects by itself and continues where you were.
Answer keys never leave the server, no THETIS examinee sees the same puzzle twice, and every THETIS and RUFIT certificate can be checked online by its ID.
From the 99.9th percentile to eight standard deviations: the Nereid, Aphotic, Hadal and Exocosm Societies admit by THETIS, RUFIT, PROTEUS or QUADRAVA-FR, with no membership dues.
The surface · 99.9th percentile
“First among those who see beneath the surface.”
Below 1,000 metres · 6σ
“Where no light reaches, the rarest minds make their own.”
The trenches · 7σ
“Beneath every depth, a deeper one.”
Beyond the world · 8σ
“Intelligence the universe has not yet met.”
Warm-up · not part of any test
Each row is a ring of ten cells, read one moment after another. A single black cell moves by a hidden law, and that law changes once. Tap the cell where it will be at t = 6.
Under the PROTEUS Principle of the Best Explanation, a law that has changed keeps its new form until the evidence shows another change.
Choose one cell in the row t = 6.
Pay securely with PayPal or a card. Your private test link opens at once.
THETIS adapts to you and gives each puzzle a generous clock; RUFIT gives each question a short one. Every answer is saved as you go.
Your IQ, percentile and a PDF certificate appear the moment you finish, ready for a society application (from IQ 190 after a supervised verification).
Read or download PROTEUS here, or open QUADRAVA-FR in Google Drive. There is no charge until you submit your answers.
Work alone with pencil and paper. There is no clock: take the time each problem needs.
Pay the scoring fee (US$30) on the Scoring & fees page, then email your answer sheet with your reference. Your score report arrives within 14 days.
Form B is the retest form: 40 new problems on the same blueprint and the same scale. It is not published online. It is emailed on request to candidates whose Form A answer sheet was scored at least six months earlier, and its score is reported separately, never averaged with Form A.
Meet the author
Licensed agricultural and biosystems engineer (PRC), registered engineer with the Saudi Council of Engineers and member of the American Psychological Association. He is a Triple Nine Society ambassador for the Philippines, a member of Mensa and Intertel, and a former Fellow of the International Society for Philosophical Enquiry, whose journal Telicom first published RUFIT. Every problem on this site is his original work.
“The smarter you are… the dumber you feel.”
