🏆 Competitive Games Tools

A quick 20-question reasoning quiz with an estimated score — presented plainly as entertainment, because it is not a validated intelligence test.

A timed mental arithmetic game — pick your operations and difficulty, play solo or pass the device around for turns.

The classic, with a guaranteed-safe first click, three board sizes, and flags on right-click or long-press — plus the logic patterns that solve most boards.

Six guesses at a five-letter word, with the duplicate-letter rule implemented properly and a new puzzle each day — plus what makes a good opener.

Six lives, six categories, and an option to type your own word — with the letter frequencies that make some guesses much better than others.

Three full solitaire games in one: Klondike with one or three card draw, FreeCell with proper supermoves, and Spider at one, two or four suits.

Full-rules chess against a search-based computer or another person on the same device, with castling, en passant, promotion and every draw condition.

A falling-block puzzle with the rules that make it feel right: 7-bag pieces, wall kicks, hold, ghost piece and combo scoring.

Repeat a growing sequence of colours and tones, strict or forgiving, with a best score kept on your device — and what it actually measures.

The 15-puzzle at three sizes with a shortest-route solver, plus Tower of Hanoi with its optimal solution. Every puzzle is guaranteed solvable.

Fresh arithmetic grid puzzles from 3×3 to 7×7. Every one is solved before you see it and thrown away unless the answer is unique.

Eat the dots, dodge four chasers that each hunt you differently, and turn the tables with a power pellet. Tunnel escape and doubling catch scores.

Hold off a marching alien formation with three lives and four crumbling shields. The fleet speeds up as you thin it out, and only the lowest in a column fires.

Fresh Einstein-style logic puzzles with a grid to work on. Every puzzle is checked to have exactly one answer, and every clue is proven to be needed.

Climb from one word to another changing a single letter at a time. Always-solvable puzzles, plus a solver that connects any two words by the shortest route.

Match free tiles off a stacked layout. Every board is dealt with a guaranteed solution, three layouts, plus hint, shuffle and undo.

Fire bubbles at the ceiling, match three to pop, and cut the supports so whole chunks fall. Wall bounces, an honest aim line, and levels that clear.

Swap touching gems to line up three or more, with cascades that multiply your score and a board that never deals an impossible position.

Crack a phrase hidden by a letter-for-letter substitution cipher. Letter counts, a frequency crib, and hints when you are stuck. No letter stands for itself.

Two timed word games — unscramble words against the clock, or find every word hiding in nine letters.

Seven letters, one in the middle that every word must use. Find as many words as you can, hunt the pangram, and climb from Beginner to Genius. New puzzle daily.

Find words in a grid of letter dice before the clock runs out, then see every word you missed. Real Boggle dice, 4×4 and 5×5, timed or untimed.

Break every brick with a ball and a paddle — angled returns, power-up drops and unbreakable bricks, in the tradition of the 1976 original.

Six timed drills in one place — Schulte table, Stroop test, chimp test, n-back, number memory and visual memory. Bests kept on your device.

Quiz yourself across eight topics — geography, space, animals, science, history, maths, food and film — with every question checked against a source.

Click the moment the screen turns green, over a run of five or ten, with the measured reason the board ranks the mean rather than the median.

Combine matching tiles to reach 2048, with the corner strategy that turns a luck-based game into a solvable one.

The classic — eat the food, grow longer, and avoid your own tail, with the space-management strategy that decides long games.

Flip cards and find the matching pairs, with the recall techniques that actually improve scores rather than relying on raw memory.

Test and train your mouse accuracy and speed by clicking targets, with the sensitivity and consistency advice that actually improves scores.

Read a hex code and pick the swatch it matches. Three difficulties, each closing to a gap your eye can still actually resolve.

Guess whether the next card will be higher or lower and build a streak — with the counting that turns a guessing game into a calculable one.

Test your knowledge of 90s skate punk — the bands, albums, labels and skate culture — solo or as a group, with a global scoreboard.

Press a cell and its neighbours flip. It is linear algebra in disguise — only about a quarter of 5x5 patterns can be cleared at all.

Fill the board from the top-left corner before the moves run out. Greedy play is a good baseline and provably not the answer.

Crack the hidden code from black and white pegs. The scoring is a two-pass count, and the obvious one-pass version is wrong.

Jump pegs to leave just one. Where the last peg can end is decided by the opening — a mod-3 invariant rules out most squares.

Push boxes onto targets. You can push but never pull — so a position can become unwinnable without anything looking wrong.

Slide the cars aside and drive the red one out. Every stated move count is proved by search, not estimated.

Any two cards determine a unique third — which is why the 81-card deck contains exactly 1,080 sets, by arithmetic rather than search.

Push your luck with six dice. Rolling one die farkles exactly two thirds of the time; rolling six, just 2.3% — a factor of nearly thirty.

Thirteen categories, three rolls a turn. The 63-point bonus is exactly three of each number — 3 x 21 — which reframes the whole upper section.

Roll two dice, close tiles summing to the roll. Without the one-die rule the box literally cannot be shut — two dice can never make 1.

Symbols, names and atomic numbers, with distractors drawn from nearby elements. Eleven symbols come from Latin, not English.

Guess the order of magnitude. Scoring is logarithmic, so being ten times out costs the same whether the answer is forty or forty billion.

Name the country from its flag, or its capital. The largest city is offered as a wrong answer, because that is the one people give.

Four times the holes is only about a quarter harder. Fitts's law explains why, and the clock is what actually decides the game.

A typing game is a queue. It shows the speed each level actually requires next to yours, because falling faster is not what makes it hard.

A faster lane is not a more dangerous one. How much of the time a lane is blocked does not depend on its speed at all.

A third of all Kakuro clues can be made in exactly one way, and they sit at the extremes. Play a puzzle, or use the table.

A 3 can be more forced than a 6. The island number means nothing without its neighbour count, and 40% of combinations are forced.

A 3 tells you no more than a 1 — both leave four possibilities. The 0 is the only clue that settles anything on its own.