# \[Userscript\] RadicalGuessr - Enhance Kanji Lessons By Guessing The Radicals First! **URL:** \ **Category:** API And Third-Party Apps\ **Created:** [December 13, 2025, 2:37am UTC](https://community.wanikani.com/t/userscript-radicalguessr-enhance-kanji-lessons-by-guessing-the-radicals-first/72861 "2025-12-13T02:37:18Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![Kurafutekkusu](https://sea1.discourse-cdn.com/wanikanicommunity/user_avatar/community.wanikani.com/kurafutekkusu/32/769621_2.png) [@Kurafutekkusu](https://community.wanikani.com/u/Kurafutekkusu)\ **Post date:** [December 13, 2025, 2:37am UTC](https://community.wanikani.com/t/userscript-radicalguessr-enhance-kanji-lessons-by-guessing-the-radicals-first/72861/1 "2025-12-13T02:37:18Z")
> ⚠ This is a third-party script/app and is not created by the WaniKani team. By using this, you understand that it can stop working at any time or be discontinued indefinitely. # **Requirements** **[General Script Installation instructions](https://community.wanikani.com/t/visual-guide-on-how-to-install-a-userscript/12136)** # **Download Script** > **[WaniKani RadicalGuessr](https://greasyfork.org/en/scripts/558787-wanikani-radicalguessr)** > > Enhance your kanji lessons by attempting to guess which radicals make up a kanji. # **Description** RadicalGuessr allows you to enhance your kanji lessons, by giving you the chance to guess which radicals make up a kanji. Hopefully, this means better retention! ![RadicalGuessr](https://global.discourse-cdn.com/wanikanicommunity/original/4X/0/e/1/0e118bf22ad94cbd6e7a51451aad73282e26b766.png) ## Incorrect Answer Demo The hidden radicals flash red when you guess wrong. > **GIF** > > ![incorrect-demo](https://global.discourse-cdn.com/wanikanicommunity/original/4X/a/2/5/a259e60293b90e9b15acd91d87d7f67ba975ea8e.gif) ## Correct Answer Demo The correct radical gets revealed if you guess correctly. Note that if there are multiple radicals with the same name, you will have to guess the same name twice (which is intentional). > **Note:** You can only guess the name displayed on the screen, not any of your own custom registered words for a radical. > **GIF** > > ![correct-demo](https://global.discourse-cdn.com/wanikanicommunity/original/4X/e/a/4/ea4e070d7def092a45bff8451e7f2a410c3cd124.gif) ### Levenshtein Distance Note The answer checker uses the “Levenshtein Distance” to allow for any small typos. This is the same mechanism WaniKani uses in reviews when you accidentally misspell an answer. ## Tap-To-Reveal Demo Tap on any of the covers to reveal what’s behind. > **GIF** > > ![tap-to-reveal](https://global.discourse-cdn.com/wanikanicommunity/original/4X/9/8/a/98a4c5391099e4db9e678654c6860829ce361cd1.gif) ## Reveal-All Demo Give up? Just tap Reveal All! > **GIF** > > ![submit-all-demo](https://global.discourse-cdn.com/wanikanicommunity/original/4X/a/b/5/ab56a941c34e6988452be5331812d37e1f4727b0.gif) ## Extra Notes I tried using as much of the existing WaniKani UI as possible to make sure the experience feels consistent to other places. The input is the same as the main quiz (just smaller), and you can use both the **Enter** key and the arrow button to submit your answer. The button is the primary button. The colours are all in the WaniKani palette. The input only gets validated against the radical text that is there on the screen. This means that if you added any custom words for any of the radicals, they won’t get registered. There is a small bug where if you refresh a page whilst on a lesson, it takes a second for the quiz to load up, and therefore you might see the radicals before they get covered up. This doesn’t seem to be a problem for when you’re coming to this page from the dashboard, or when navigating between lessons, just during refresh. This is mainly because the `turbo-load` event happens just a little bit too late, but putting the callback on any other event causes other issues. If anyone has any advice or suggestions, I’d be happy to hear them. # Miscellaneous > **Motivation** > > I personally wanted something like this because > > 1. It gives a chance to recall some radicals you may not have seen in a while. > 2. Making your brain work harder trying to spot the radicals hopefully means that the kanji sticks in your brain a little more! > 3. Gives practice of spotting weirdly-shaped/distorted/stretched/etc. radicals. > 4. It’s fun! > **Feedback** > > Maybe goes without saying, but I would love any feedback on this, both general, UX, and code related. If there are any bugs, please report them in the thread or on GitHub. Can’t promise I will address everything though! > **Upcoming Work** > > - Suggestions and improvements are welcome! > **GitHub** > > You can find the GitHub repository here, in case you’d like to contribute. > > [GitHub - romans-boi/wk-radical-guessr: Userscript for WaniKani to guess the radicals in lessons.](https://github.com/romans-boi/wk-radical-guessr) > **Change Log** > > **v1.1.0** - Implemented Levenshtein Distance for the answer checker, to allow for small typos. > > **v1.0.2** - Bug fix where the tooltip on the cover would still show the radical name and link. Now says ‘Tap to reveal’. > > **v1.0.1** - Bug fix where button would appear more than once on the screen. > > **v1.0.0** - Initial release. ---
**Author:** ![Kurafutekkusu](https://sea1.discourse-cdn.com/wanikanicommunity/user_avatar/community.wanikani.com/kurafutekkusu/32/769621_2.png) [@Kurafutekkusu](https://community.wanikani.com/u/Kurafutekkusu)\ **Post date:** [December 13, 2025, 11:36am UTC](https://community.wanikani.com/t/userscript-radicalguessr-enhance-kanji-lessons-by-guessing-the-radicals-first/72861/2 "2025-12-13T11:36:32Z")
**v1.0.1** is live, which means… the bug where the reveal-all button would appear more than once has been fixed. ---
**Author:** ![Kurafutekkusu](https://sea1.discourse-cdn.com/wanikanicommunity/user_avatar/community.wanikani.com/kurafutekkusu/32/769621_2.png) [@Kurafutekkusu](https://community.wanikani.com/u/Kurafutekkusu)\ **Post date:** [December 14, 2025, 9:10am UTC](https://community.wanikani.com/t/userscript-radicalguessr-enhance-kanji-lessons-by-guessing-the-radicals-first/72861/3 "2025-12-14T09:10:28Z")
**v1.0.2** is live, which means… the bug where the tooltip on the cover would still show the radical name and link has been fixed! Now says ‘Tap to reveal’. ![Tooltip Example](https://global.discourse-cdn.com/wanikanicommunity/original/4X/a/4/e/a4ed8e89f0799f87075c3df4e787d0bc4b0ef9a1.png) (Idk why the screenshot doesn’t capture my mouse pointer 😭) ---
**Author:** ![Kurafutekkusu](https://sea1.discourse-cdn.com/wanikanicommunity/user_avatar/community.wanikani.com/kurafutekkusu/32/769621_2.png) [@Kurafutekkusu](https://community.wanikani.com/u/Kurafutekkusu)\ **Post date:** [January 16, 2026, 6:31pm UTC](https://community.wanikani.com/t/userscript-radicalguessr-enhance-kanji-lessons-by-guessing-the-radicals-first/72861/4 "2026-01-16T18:31:27Z")
**v1.1.0** is live, which means… I’ve added the ability to tolerate typos, same way WaniKani still passes an answer even if you misspelled it slightly. Why? Because I thought it’d be fun 😄 ### Nerd Notes I wanted to add a mechanism that allows for typos much like WaniKani does. So, I started searching, and found out about Levenshtein Distance! I thought the concept was quite cool - you calculate a ‘distance’ between 2 words by looking at the number of substitutions, deletions, and insertions it would take to transform all the substrings of both words. Before long, I discovered that actually that is _exactly_ what WaniKani already uses. I ended up copying WaniKani’s implementation, as well as their tolerance measures, both for consistency and because I couldn’t find an easy way to ‘import’ the JS utils they have (I’m not a JS dev, idk what I’m doing 💀). If anyone knows of an easy way, let me know! If anyone is curious at all about learning the technical bits behind Levenshtein Distance, I’d highly recommend these few resources that helped me understand it (to clarify, they’re not made by me): **[YouTube video for algorithm walkthrough](https://www.youtube.com/watch?v=Dd_NgYVOdLk)** **[Geeks for Geeks explanation with various implementations](https://www.geeksforgeeks.org/dsa/introduction-to-levenshtein-distance/)** **[Medium article with a useful walkthrough](https://medium.com/@art3330/levenshtein-distance-fundamentals-817b6f7f1718)** I heard that if you install this userscript, Levenshtein himself may visit your home. ---
**Author:** ![straille](https://sea1.discourse-cdn.com/wanikanicommunity/user_avatar/community.wanikani.com/straille/32/581859_2.png) [@straille](https://community.wanikani.com/u/straille)\ **Post date:** [September 30, 2026, 8:16pm UTC](https://community.wanikani.com/t/userscript-radicalguessr-enhance-kanji-lessons-by-guessing-the-radicals-first/72861/5 "2026-09-30T20:16:23Z")
maybe i should actually mention here that the recent update broke this script, instead of stupidly waiting around and apparently expecting it to fix itself, lol