Learning and self-testing — not a test of you
200 original puzzles in 8 categories, each on a 1-to-5 difficulty ladder, with an explanation that teaches the method behind every answer.
Puzzles are a low-friction way into reasoning practice. You do not have to sit a full aptitude suite or work a hundred-item cognitive bank to get something out of an afternoon here — you can open one category, work three puzzles, and leave with a named technique you did not have before.
The method is the product. Every puzzle shows its explanation as soon as you check an answer, and every explanation does the same three things: it names the technique, walks the one move that collapses the problem, and tells you how to spot the same shape next time. Reading the explanation when you were right is where most of the learning is — being right by luck and being right by method look identical from the outside.
Nothing here is timed and nothing is scored server-side. Your answers are checked on this device, and the only figure any page will show you is a raw count of what you solved in that sitting.
This is not an IQ test, not a cognitive assessment, and not a diagnostic instrument. Solving puzzles here produces no score of record, no percentile, and no band that could be read as an ability estimate — deliberately, because a self-administered, untimed, unproctored puzzle set cannot support one honestly. Nothing here can be used for Mensa qualification, giftedness identification, educational placement, employment selection, or any accommodation or medical decision.
Puzzle items are also never reused as unseen scored questions in any Novus Learn assessment, so reading an explanation here can never advantage or disadvantage you elsewhere on the site.
Every category publishes the same 25-puzzle ramp, so a difficulty 3 in one category means roughly what a difficulty 3 means in another, and the same rung number is comparable across all 8:
Working straight through a category takes about 435 minutes across all 8 categories, but that is a guide, never a limit.
Difficulty 1–5
Constraint puzzles solved by ticking and crossing a grid. Each one gives you a small cast, a set of attributes, and clues that never state the whole answer — so you close the board by elimination, negative inference, and, at the top of the ladder, a hypothesis you deliberately break.
Trains: Constraint tracking · Systematic elimination · Negative inference · Grid notation
Difficulty 1–5
Twenty-five original runs of numbers, each with one term blanked out, from a single repeated step up to two rules interleaved. The method is the point: difference tables, ratio checks, splitting a run by position, and the discipline to test a rule against every printed term before trusting it.
Trains: Inducing a rule from a short run · First, second and third difference analysis · Recursive and interleaved rules · Resisting the first plausible rule
Difficulty 1–5
Anagrams, letter series, analogies and odd-one-out items built on ordinary English words. Every puzzle is solved by working on the letters themselves and on the relations between words rather than by recalling facts, and every explanation names the technique it used.
Trains: Letter-position reasoning · Analogy and relation mapping · Category and structure discrimination · Anagram search strategy
Difficulty 1–5
Situations that look impossible until you notice the assumption you brought to them. Every scenario is fully stated: the resolution follows from the listed facts plus everyday knowledge, never from a hidden trick, and every explanation names the assumption that was doing the damage.
Trains: Surfacing hidden assumptions · Reframing a stuck problem · Separating what was stated from what was inferred · Testing a rival explanation against every fact
Difficulty 1–5
Rotations, reflections, folded paper, cube nets, pattern matrices, and careful counting of the parts of a figure. Everything is described in words as well as drawn, so nothing here depends on colour or on picking out fine detail.
Trains: Mental rotation and reflection · Paper folding and net visualisation · Systematic counting of visual parts · Viewpoint and orientation changes
Difficulty 1–5
Twenty-five puzzles about what actually follows. You work from stated rules, comparisons and statements to a single fact — and, on the last rung, to the honest verdict that the clues do not settle it. Each explanation names the technique so you can spot the same shape next time.
Trains: Valid steps and their invalid look-alikes · Quantifier care: all, no, most, some · Ordering and scheduling under constraints · Truth-teller and liar bookkeeping · Recognising when clues underdetermine the answer
Difficulty 1–5
Number problems that reward a method rather than a memorised formula: multi-step arithmetic, ratio and percentage sense, rates, and small tables where the trap is measuring against the wrong base. Every puzzle is solvable with mental arithmetic or a few written lines, so no calculator is needed.
Trains: Multi-step arithmetic without a calculator · Ratio, fraction and percentage sense · Rate, speed and work reasoning · Reading a small table against the right base · Carrying an intermediate result exactly
Difficulty 1–5
Twenty-five original puzzles in substitution, transposition, and key recovery. Shifts, mirrored alphabets, keyword alphabets, rail fences, repeating keys, and check letters — all workable by hand, each with an explanation that shows the arithmetic rather than simply naming the message.
Trains: Substitution and transposition systems · Crib and frequency reasoning · Recovering an unknown key · Systematic checking of every letter
Puzzles sit alongside two other untimed, explanation-first surfaces. If a category here hooks you, the matching skill pages go deeper with lessons and larger practice banks:
