Radardle

About Radardle

Radardle sets up a short course with a start marker A, a finish marker B and the distance between them. A figure or vehicle crosses it three times: first a slower run and then a faster run, each with its speed shown on a sign, and last a mystery run with a blank sign. You type your estimate of the mystery run's speed, which always lies between the two posted speeds, and the reveal shows the true figure, how far off you were and your points.

The daily set is five rounds, the same for every player, and it changes at midnight UTC. A round is worth up to 1,000 points. A close miss costs almost nothing, while being 10% off costs about 200. Once the runs have played you can replay any of them, but each replay also costs 200 points, so it is a bet on whether a second look will sharpen your guess. There is no timer.

Beyond the daily set there is a seeded mode, where five rounds are fixed by a seed of up to eight hex digits that you can share with friends, and an unscored endless practice mode with free replays. Blind play, for seeded and endless rounds, hides the two reference runs and leaves only the mystery run and the distance, so you work out the speed from distance and time; a blind round is worth up to 1,750.

Radardle is run by RG GameDev, LLC. It has no accounts, no advertising and no tracking, and it keeps your stats and daily streak under a random ID in your browser, with a one-time code to move them to another browser. Speeds can be shown in mph or km/h. It suits players who like judging by eye, such as the daily angle and timing games, more than word or trivia puzzles.

How to play Radardle

1. Open Radardle and choose Play today's set to start the daily five rounds.
2. Press Play round and watch the slower run and then the faster run cross from A to B, noting the speeds on their signs.
3. Watch the mystery run over the same distance and compare how long it takes with the first two.
4. Type your estimate of its speed, which lies between the two posted speeds, and lock it in.
5. Read the true speed and your score, then go on to the next round until all five are done and copy your result to share.

Tips

• Count beats or seconds as each run crosses from A to B: speed over a fixed distance is just the inverse of the time taken.
• Remember that halfway in time is not halfway in speed; a run that takes the middle time is slower than the average of the two speeds.
• Only buy a replay when you are truly unsure, since it costs as much as a 10% miss.
• Use the endless practice mode, where replays are free, to calibrate your sense of timing before the daily set.

Questions