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 one of ten untimed online tests, from AMPHITRITE, open to everyone, and QUADRAVA-FR for the gifted range to PROTEUS at the summit, each with an instant certificate. Every problem is the original work of Jo Christopher Resquites, MEng.
New to IQ tests? Try the practice puzzles first · Compare the thirteen tests · Know your IQ? Help norm THETIS
Thirteen 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, PROTEUS when you want the summit, NEREUS, THAUMAS, GALENE or EIDOTHEA for untimed tests of new kinds of reasoning, and the adaptive AMPHITRITE, DYNAMENE, PRONOE, PSAMATHE and the new PANOPEA, figure matrices against the clock.
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 16-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 three 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 · untimed · four forms
NEREUS sets 40 problems in five families: analogies, hidden transformations, constraints, invariants and counterfactuals. Retake it on a new form, up to four times.
Take NEREUSOnline · untimed · experiments
THAUMAS hides a small system in every problem. Choose four of its eight experiments, read the results, then answer. Retake it on a new form, up to four times.
Take THAUMASOnline · untimed · new problems every attempt
GALENE shows how two hidden gates move the dots on a board, and asks what must follow. Every attempt draws 40 problems you have never seen; retake it up to ten times.
Take GALENEOnline · untimed · three judgments
EIDOTHEA gives evidence that several hidden structures fit. For each claim, decide whether it must hold, cannot hold or stays unresolved.
Take EIDOTHEANew · online · adaptive · ages 16 to 80
AMPHITRITE sets twelve kinds of visual reasoning, open to everyone. A practice problem for each family shows the reasoning; then every problem is chosen from your answers so far.
Take AMPHITRITENew · online · adaptive · relational
DYNAMENE sets small worlds of letters and arrows: find the role a node must play, the pattern three worlds share, the one arrow that breaks a pattern everywhere.
Take DYNAMENENew · online · adaptive · ages 16 to 80
PRONOE hides the rules of a small machine that changes two digits every round. Find them from a few rounds of evidence, then forecast its state, up to four rounds ahead.
Take PRONOENew · online · adaptive · ages 16 to 80
PSAMATHE gives you lettered nodes and windows of evidence: build the network they demand, repair one with the fewest changes, refute a claim, or survive a lost link.
Take PSAMATHEOnline · adaptive · instant
Puzzles from eight 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, facet scores and a PDF certificate anyone can verify. US$19.99 per session, with new puzzles every time.
New · online · adaptive · timed
Figure matrices, the classic nonverbal format: nine panels with the last one missing, and eight answers drawn as pictures. Two practice problems with their reasoning, then 24 problems chosen from your answers, each with its own clock, in about half an hour. US$19.99 per attempt, with new problems every time.
Volunteers · a known IQ
Do you know your IQ from a professionally given test, such as the WAIS or the Stanford-Binet, or a supervised Raven's, Cattell or high-IQ society test? Volunteer to help place the THETIS puzzles on the IQ scale, and take THETIS for the first time at half the fee. Your earlier score never changes your own THETIS score.
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 THETIS session ends with your score report and a PDF certificate: your IQ with its 95% range and rarity, and your rule complexity, the complexity of the rules you solve half the time beyond chance.
Every score comes with a margin of error, and each test is most precise inside its own band. THETIS covers IQ 55 to 200 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 55–200 | about ±9 IQ points (95%) over most of the range | reporting ceiling IQ 230+ |
| 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 |
| NEREUS | IQ 130–210 (model) | about 5.5 IQ points (model error) | IQ 239 (raw 39), nominal cap 250 |
| THAUMAS | IQ 131–209 (model) | about 5.4 IQ points (model error) | IQ 238 (raw 39), nominal cap 250 |
| GALENE | IQ 120–230 (model) | about 8 to 9 IQ points (model error) | IQ 248 (raw 39); 258 at a perfect score |
| EIDOTHEA | IQ 114–169 (model) | about 4.5 to 5 IQ points (model error) | IQ 202 at a perfect score |
| AMPHITRITE | IQ 55–210 (adaptive model, simulated) | about 5 to 7 IQ points (simulated) | research range to IQ 225+ |
| DYNAMENE | IQ 70–250 (adaptive model, simulated) | about 6 to 8 IQ points (simulated) | IQ 250+ at the top |
| PRONOE | IQ 70–145 (adaptive model, simulated) | about 4.5 to 7 IQ points (simulated) | IQ 180+ at the top |
| PSAMATHE | IQ 70–145 (adaptive model, simulated) | about 4.5 to 7 IQ points (simulated) | IQ 180+ at the top |
| PANOPEA | IQ 70–150 (adaptive model, simulated) | about 5 to 6 IQ points (simulated) | IQ 160+ at the top |
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, every NEREUS and THAUMAS attempt is on a form its examinee has never seen, every GALENE, AMPHITRITE, DYNAMENE, PRONOE and PSAMATHE attempt on problems its examinee has never been shown, and every certificate can be checked online by its ID.
From the 99.9th percentile to eight standard deviations: the Nereid, Mesopelagic, Aphotic, Hadal and Exocosm Societies admit by thirteen original tests, with no annual dues.
The surface · 99.9th percentile
“First among those who see beneath the surface.”
The twilight zone · 4σ
“Where the last light reaches.”
Below 1,000 meters · 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.
More puzzles like this, and news of the tests: follow EngineeredIQ on Facebook, LinkedIn or Instagram.
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 and PANOPEA give each problem a short one; the ten untimed tests give you up to 90 days. Every answer is saved as you go.
Your IQ and a verifiable PDF certificate appear the moment you finish, ready for a society application with any qualifying test.
The problems of the untimed tests appear only to a candidate whose test is open, and the answer keys never leave the server.
Each page carries a faint watermark of your name and certificate ID, and the test records what could signal outside help, sealed with your answers.
The author reviews every result before it counts for a society, and your certificate can be checked by anyone on the Verify page.
Meet the author
Licensed agricultural and biosystems engineer (PRC), member of the Philippine Society of Agricultural and Biosystems Engineers since 2003, 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, Intertel and the Glia Society, 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.”
