🏆 Competitive

A database of essentially every named summit on Earth, with prominence figures, ascent logs and rankings that fuel very long arguments.

Penalty shootouts through a whole tournament, against a keeper who reads your run-up better than you would like.

Draw a circle with the mouse and get scored on it to one decimal place. Nobody in recorded history has stopped after one attempt.

Draw a circle with one unbroken stroke and get scored on how round it actually was. Nobody beats 97% on a trackpad.

Names a pixel size and asks you to drag a box exactly that big. Nobody is as good at this as they assume.

A plain, fast game server that has outlived every redesign trend since 2001 and still hosts chess, draughts and mahjong.

A noughts-and-crosses grid where every square needs a Pokemon matching two criteria at once, scored on how obscure your picks were.

Spin up a private poker table and send the link round: no accounts, no downloads and no actual money involved.

Low-poly time trials with a built-in track editor, hundredth-of-a-second leaderboards and a restart key you will wear out.

Click the cat, the cat pops, and every click is added to your country's total in a global leaderboard nobody asked for.

The Only Connect connecting wall in thousands of user-made versions: sixteen clues, four groups, two and a half minutes.

Take a quiz or build one and send it on. Results are shareable without anybody having to make an account first.

Four Wordle grids solved at the same time with nine shared guesses, which is exactly as stressful as that sounds.

A browser railway empire where the whole server races to reach the same era of engines before anybody else does.

Loose-surface rally driving where every corner is taken sideways, largely because there is no other way to take them.

The obsessive's music database, where every release is rated, charted and argued over by people with extremely firm opinions.

Reaction time, visual memory, number span and typing speed, each scored against everyone else who has taken it.

Low-poly team shooter with tanks and jetpacks, free and playable the moment the page finishes loading.

Pixel American football hiding a full franchise manager behind six-second passing plays. Has ruined more workdays than it should have.

Eight and sixteen-bit console libraries running in the browser, organised by system, with save states that actually work.

Find one to twenty-five scattered across a grid, in order, against the clock. The standard peripheral-vision and attention drill.

Drag the control points of a letter back into shape. Your score is how far off the real typeface you landed.

Random design briefs with a countdown attached, for when the problem is not skill but having nothing to work on.

A first-person shooter in which every player is an egg and every hit is messy. Considerably better than that premise deserves.

A persistent economic simulation where thousands of players genuinely supply each other, so prices move for real reasons.

Grow a snake on glowing pellets and cut other players off so they burst into more of them. The .io boom started here.

Three-minute kart deathmatches with weapon crates and absolutely no patience for anything resembling a racing line.

Fast three-a-side football with sliding tackles and a World Cup bracket you can win inside a tea break.

Daily solitaire challenges dealt from guaranteed-winnable shuffles, with a leaderboard for people who want the streak.

Seven letters, one compulsory centre letter, and the long climb from Solid to Genius. Ruins mornings extremely productively.

Hundreds of thousands of user-made timed quizzes: name every element, every country, every Friends character. The genre's warehouse.

Survival game about not freezing to death, in which the other players are the weather's most enthusiastic accomplices.

Categories under a random letter and a timer: name a country, a food and an animal starting with M, then hit stop before anyone else.

The seven-day jam build where time only moves when you do, still free in the browser and still one of the decade's best ideas.

Real-time First World War grand strategy played over weeks against dozens of other people, most of whom will lie to you.

The community revival of surviv.io, the sharp little 2D battle royale that was shut down and flatly refused to stay dead.

Base building with tameable pets, farming and raids, which is a lot of systems for something that loads instantly.

Sprint away from a large monkey along a crumbling temple path, dying at the same badly signposted corner every time.

Hundreds of players carve up a real world map using one attack slider. Diplomacy emerges in the chat within ninety seconds.

Competitive multiplayer stacking with modern rules and opponents who will finesse you into the floor within ninety seconds.

The official browser Tetris, marathon mode included, so you can settle the argument about whether you are still any good.

Teaches the pen tool by making you trace shapes with the fewest possible anchor points. Level nine is genuinely cruel.

Combine shapes with union, subtract and intersect to hit a target silhouette in as few operations as you can manage.

Bisect angles, find midpoints and judge parallels by eye, then get told in pixels precisely how wrong you were.

Two Google search terms, one question: which one gets searched more? Your instincts are far worse than you think they are.

Coin-operated arcade cabinets from the seventies onward, emulated in a tab, attract mode and all.

Race from one Wikipedia article to another using only links, against a clock and other people online.

Text-based crime MMO running since 2004, where the market, the gyms and the prison are all operated by other extremely committed players.