How to Play Stroop Sprint: the Colour Word Test as a Team Race

The Stroop effect is the psychology-class demonstration where the word RED is printed in blue ink and your brain reads the word before it sees the colour. Stroop Sprint takes that and races a room through sixteen rounds of it, with the answer window tightening from four seconds down to two.

The instruction never changes and is never intuitive: name the ink, never the word. Everybody understands that in five seconds and nobody stops finding it hard, which is what makes it work as a group game rather than a demonstration.

How to play Stroop Sprint

1. A host creates a room and shares the link. Players join with a name - no avatar to pick, no account.
2. Once started, everyone sees the same colour word in the same mismatched ink at the same moment.
3. Tap the swatch matching the ink the word is printed in. If the word GREEN is printed in yellow, the answer is yellow.
4. You can answer with the mouse or from the keyboard using 1234, QWER, ASDF or ZXCV - four rows mapping to the four swatches.
5. Answer inside the round's window, which starts at four seconds and shrinks to two by round sixteen. A wrong or missed round scores nothing.
6. After sixteen rounds a leaderboard appears, ranked by accuracy first and average reaction time second, with the top three highlighted. A replay then shows one tile per round per player, coloured with that round's ink and crossed where they slipped. The host can rematch everyone with one button.

Strategy and tips

• Squint, or let your eyes go slightly out of focus. Blurring the letters makes them harder to read as a word and easier to see as a colour.
• Look at the middle of the word rather than the start. Reading is left-to-right and starting at the first letter is what triggers it.
• Learn the keyboard mapping before the game starts. Hunting for a swatch with the mouse costs more than the interference does.
• Do not try to go faster after a mistake. The Stroop cost rises with speed, so the round after an error is the one you are most likely to lose too.
• Accuracy outranks speed in the final table, so sixteen careful correct answers beat fourteen fast ones. Play at the edge of the window, not ahead of it.

What makes Stroop Sprint different

Stroop tests online are almost always single-player instruments that hand you a score and a percentile. Turning it into a synchronised sixteen-round race means everybody experiences the same interference at the same moment, and the leaderboard measures the group against itself rather than against a norm table.

The replay grid is the part people talk about afterwards. Each round is redrawn in the ink colour that caused the trouble, so you can point at the exact round where half the room fell for the word.

Frequently asked questions

More to read

• Free browser games to play with your team, no signup: Games that start in one click, work on a call, and never ask anybody to make an account.
• Free Jackbox alternatives you can play in a browser: Party games with the Jackbox shape - shared screen, everyone plays on their phone - without the purchase or the stream.