Main Change Logs

ver. 14.13 - 02/12/2026

• Fixed an issue where you could not add the second or subsequent note using the Add button on the note tab of the chart editor.

ver. 14.12 - 02/09/2026

• Fixed an issue where the cursor would reset each time a note was edited when multiple notes were placed at the same time.

ver. 14.7 - 02/04/2026

• Added a contact link and a back-to-top button to the server error page.
• Implemented an error message display for client errors.

ver. 14.6 - 02/03/2026

• Fixed an issue where the chart editing page was slower than in ver.13.

ver. 14.0 - 02/01/2026

• The site design has been revamped.
• Added a feature that automatically adjusts the chart offset in real time during play.
  • You can disable this in the options and continue to set it manually as before.
• The frame rate setting has been removed; now it's automatically adjusted.
• The copy/share link buttons have been redesigned so that the copy button only copies the URL.
  • On PC, you can copy both the text and URL from the "Share" menu as before, or post directly to .
  • On Android/iOS, pressing the "Share" button will display the OS's share menu as before, allowing you to send to other apps.
• Game screen design changes
  • Notes are now semi-transparent, and a trail has been added.
  • The judge line lights up even in autoplay.
  • Added a score gauge.
  • Score per note is now displayed.
  • Added animations to display the chain count every 50 chains and misses.
  • The UI is larger than ever on PC with larger screen sizes.
• The color of YouTube video borders changes to match the video thumbnail.
• The order of overlapping notes has been reversed on both the play screen and the score editing screen.
• Chart editing function
  • You can now delete notes using the Delete key / BackSpace key.
  • Added the ability to flip notes horizontally. ( M key)
  • The size of one step and the zoom state are now saved with the chart data.
  • The cursor and barline positions are now easier to see in the code tab.
  • Fixed the behavior when selecting a range in the code tab.
• Overwriting a chart from previous versions (ver. 7-13) will no longer erase play history if no changes have been made to the content.
• Starting with this version, the license of the source code of Falling Nikochan has been changed from MIT to AGPL-3.0

ver. 13.21 - 01/07/2026

• In auto-play mode, notes will always result in a "Good" judgment.
  • Adding &judgeauto=1 to the URL will restore the previous behavior.

ver. 13.18 - 12/23/2025

• Fixed the calculation of the appearance position when notes appear during chart speed acceleration/deceleration.

ver. 13.15 - 11/29/2025

• When sharing results played at different speeds, the playback speed is now displayed.

ver. 13.10 - 11/05/2025

• Fixed an issue where notes with judgments during chart speed acceleration/deceleration were moving at speeds different from the specified values.

ver. 13.8 - 10/29/2025

• Disabled key input and tap judgments during auto-play.

ver. 13.4 - 09/28/2025

• Even in the portrait UI for smartphones, a mark will now be displayed if there is unread content in the update history.

ver. 13.3 - 09/28/2025

• Improved stuttering of note movements during play on smartphone environments.

ver. 13.1 - 09/25/2025

• Added an API reference.

ver. 13.0 - 09/21/2025

• An official (Twitter) account @nikochan144 has been launched. It will automatically tweet when a new chart is published or updated.
• Added tap sound and metronome sound to the chart editor.
  • You can turn it on/off and set the volume from the Timing tab.
• The cursor movement in the editing screen has become especially faster on smartphones, etc.
• You can now submit the password in chart editing by pressing Enter.
• Changed the appearance of slider inputs such as volume adjustment.
• You can now load a locally saved chart file by dragging and dropping it into the newly created chart editing screen.
• Added a feature to smoothly accelerate and decelerate the speed of the chart.
  • In the code editor, specify it with AccelEnd(bpm).
• The text shared when sharing charts and play records now includes the default hashtag "#fallingnikochan".
• You can now share play records even when you play at a playback speed other than ×1.

ver. 12.49 - 09/02/2025

• Disabled the right-click menu during play.

ver. 12.44 - 07/29/2025

• All public charts are now displayed in the latest chart list.
  • Scrolling down will load more charts.
  • Similarly, in search results, more charts will be loaded by scrolling instead of pressing a "Show more" button.

ver. 12.33 - 07/12/2025

• Added a feature to save and share play results as an image.

ver. 12.30 - 06/22/2025

• Added options to play from the middle of a chart and to change the playback speed.

ver. 12.21 - 06/06/2025

• Added a feature to predict and correct unresponsiveness in Safari on iOS.
  • If a tap does not respond and is skipped, it will not result in a miss judgment, allowing the chain to continue (though this may not always happen).
  • The tap sound is not corrected, so it is turned off when the unresponsiveness correction is enabled.
• Fixed the judgment for big notes that are placed in short intervals.

ver. 12.19 - 05/30/2025

• The play count from test plays in the chart editor is no longer reflected in the order of popular charts.
• The play count for each chart is now counted less when a user plays the same chart multiple times.

ver. 12.18 - 05/29/2025

• Added icons to indicate whether the play record was made with keyboard or touch controls when sharing play records.
• You can now generate a play record sharing link from the best score saved.
  • For records played before ver. 12.18, some information such as date may not be displayed.
• The colors of the badges indicating clear status in the chart list now change according to the level.
  • Also dots indicating unplayed charts are now displayed according to the number of levels.

ver. 12.11 - 05/18/2025

• Added a search and replace function in the code editor of the chart editor by pressing Ctrl+F (or ⌘+F).

ver. 12.9 - 05/17/2025

• Added a fade-in and fade-out effect for notes that appear and disappear within the screen.

ver. 12.8 - 05/17/2025

• Added a feature to delete the chart data saved on the server.
• Added a confirmation dialog when deleting levels in the chart editor.

ver. 12.7 - 05/10/2025

• Clarified the browser versions supported by Falling Nikochan.

ver. 12.0 - 05/06/2025

• Implemented a function to search for charts by song name, composer, etc.

ver. 11.35 - 05/06/2025

• Fixed an issue where the processing speed slowed down each time a note was hit on Android Chrome.

ver. 11.30 - 05/03/2025

• Changed the icon and color settings when adding to the home screen as an app.
  • If the icon already added to the home screen does not update automatically, please delete it and add it again.
• Changed some of the faces of Nikochan.

ver. 11.27 - 05/02/2025

• Enlarged the display of song names, etc. when playing on a screen size like an iPad.

ver. 11.21 - 04/28/2025

• Fixed an issue where the background appeared completely white on iOS 16 and earlier.

ver. 11.19 - 04/24/2025

• Updated the sample chart list.

ver. 11.6 - 04/16/2025

• Added a badge display to show the clear and full combo status on the chart list and level selection list.

ver. 11.0 - 04/13/2025

• Added the ability to change the start and end positions of the video played when creating a chart.
• The information of the copied notes in chart editing is now saved along with the chart data (both in locally saved files and those saved on the server).

ver. 10.9 - 04/03/2025

• Added an option to limit the frame rate during play.
  • The smaller the frame rate, the lighter the operation becomes.
  • On devices where the screen frame rate exceeds 60fps, it is set to a value below 60fps by default.
    • If you have a high-performance environment such as a PC, you can manually change it to a higher value.

ver. 10.5 - 04/02/2025

• The UI has been changed for vertical displays such as smartphones.
• The field for entering the chart ID and the list of recently played charts have been moved to the top page (Home tab).

ver. 10.0 - 03/30/2025

• Falling Nikochan can now be installed as a PWA app.
  • On Android, you can install it by tapping the "Add to Home Screen" button displayed on the Falling Nikochan top page (or the What is Falling Nikochan? overview page).
  • On iOS, you can install it by selecting "Add to Home Screen" from the share button in Safari.
  • When launched as an app from the home screen, the browser toolbar will be hidden, allowing you to play comfortably in full screen.
  • (Also, when launched as an app, the entire app is downloaded before launching, so the page loads faster in slow internet environments.)
    • ver. 10.12 and later: The same behavior has been implemented when launched in a browser, so there is no difference.
    • However, you cannot play offline.
• Implemented a tap sound when hitting notes.
  • You can choose on/off in the options screen before playing.
  • On Windows, Linux, MacOS (except Safari) and Android, the judgement timing is automatically adjusted by the delay in audio output.
  • On MacOS (Safari) and iOS, the audio output delay cannot be detected, so you may need to manually adjust the judgment offset. Therefore, the tap sound is off by default.
• You can now adjust the YouTube playback volume and tap sound volume during play.
• Added a stop button at the top of the screen during play.

ver. 9.17 - 03/28/2025

• The animation of the chain count and score display moves smoothly even when the note interval is narrow.

ver. 9.13 - 03/21/2025

• When copying a shared link, the title is now included in addition to the URL.

ver. 9.10 - 03/21/2025

• The UI for selecting the level on the music details screen has been changed.
• Added a feature to display the score records of other players as a graph when selecting the level of the chart and when displaying the results after playing.
  • Only play records from ver. 9.0 (03/11/2025) onwards are collected.
• Added a popular chart list that displays the charts in order of the number of recent plays.

ver. 9.4 - 03/12/2025

• The motion of has been made smoother.
• Other changes have been made to the display and effects on the game screen.

ver. 9.0 - 03/11/2025

• The domain (URL) of Falling Nikochan has been changed to nikochan.utcode.net.
• The management of passwords in chart editing has been changed, and passwords saved in your browser previously cannot be used. You need to re-enter them.
  • The passwords of the charts uploaded to the server themselves have not changed.
• The play count of each chart has been removed.
  • May be changed soon
• The terms of service have been partially updated. It has been clarified that the IP address is saved when the chart created is saved on the server.

ver. 8.16 - 03/06/2025

• Improved the loading process on the game play screen, so the "Loading..." message will not be displayed (unless your network environment is poor).
• Various error messages have been localized.

ver. 8.15 - 03/04/2025

• When selecting a music from the Play page, the details are now displayed without switching to a new page.

ver. 8.12 - 03/03/2025

• Added a feature to share the results after playing.
  • When you press "Copy link" or "Share" on the result display screen, the play result is displayed as a preview of the shared link.

ver. 8.7 - 02/28/2025

• When sharing a link for sharing with various SNS apps, a preview image is now displayed.

ver. 8.0 - 02/22/2025

• Change in chart data format (〜.fn8.yml)
  • The file size when saved locally has been reduced compared to before.
  • Chart data from ver. 7 will be automatically converted to ver. 8. This conversion is 100% compatible and does not change the behavior of the chart.
• Implemented the display of speed changes in the notes during play as a hidden feature.
  • Add &speed=1 to the URL to display it.
• Changed the limit of the chart size that can be uploaded from 1000kB to 20000 events based on the number of events.

ver. 7.15 - 02/21/2025

• Added an image of in addition to , and made it animate.

ver. 7.11 - 02/14/2025

• Added an audio offset adjustment option on playing.

ver. 7.6 - 02/12/2025

• The layout of the chart list on the top page has been improved, adding YouTube thumbnail images for each chart and date display for the new chart list.

ver. 7.5 - 02/12/2025

• The color of the chain count display during play has been changed.
  • Instead of suddenly changing color when reaching 100 chains as before, the color now gradually changes according to the chain count.
  • If there is at least one bad or miss judgment, the color will not change regardless of the chain count.

ver. 7.0 - 02/11/2025

• Changes to score data specifications (〜.fn7.yml): You can now specify whether notes start displaying from the top of the screen or as if they're being thrown upwards.
  • This allows you to achieve, for example, notes falling from directly above (vx = 0).
  • When loading legacy chart data on the play mode, the previous program is used, and the behavior is exactly the same as before.
  • When loading legacy chart data on the chart editing mode and saving it overwrites it, it is converted to the ver. 7 chart format. This change may result in some note behavior changes from previous versions. Please test play to ensure the chart is not unintended.
• The entire app now supports English. Browser settings and other settings are automatically detected, but you can also switch languages using the Language button at the bottom of the screen.
  • Some parts of the play screen and editing screen that were previously written in English are now almost entirely displayed in Japanese when in Japanese display mode.
• The display of song titles and other information on the play screen has been enlarged.
• The help screen for chart editing has been reduced in text and made easier to read. For more detailed explanations, hover (or tap) the in the editing screen.
• Users can now choose whether or not to save passwords when editing charts.
• When the app is updated, the link to this update history page (next to the version number at the bottom of the screen) now displays an unread mark.

ver. 6.11 - 11/24/2024

• Added the ability to make charts public / Added a "Latest charts" list to the top page (Play page).
• (Charts uploaded prior to this will be private by default.)
• Up to 25 charts will be displayed in order of newest. Feel free to submit your own.

ver. 6.1 - 11/17/2024

• The format of files saved locally when editing charts has been changed. (〜.fn6.yml)
  • Files can be opened in text editors such as Notepad.
  • Files in previous formats (such as 〜.fn5.mpk) can still be loaded (they will be automatically converted to the new format).

ver. 5.28 - 11/15/2024

• Added the ability to hide certain levels of charts uploaded to the server.
  • Select a level in the Level tab of the chart editing screen and check "Hide this level" to prevent it from appearing on the chart sharing screen.

ver. 5.26 - 11/12/2024

• Improved display on the results screen.

ver. 5.25 - 11/10/2024

• Added an effect display when hitting Nikochan.
  • Instead, the chart multiplier display in the upper right corner of Nikochan has been removed.
• A hidden feature has been added to display the current frame rate.
  • Adding &fps= to the end of the URL on the gameplay screen will display it in the lower left corner.

ver. 5.22 - 11/09/2024

• A dark theme has been implemented. You can switch to it from the Theme button in the lower right corner of menu pages, etc.
• The play screen and editing screen now always open in a new tab.

ver. 5.19 - 11/05/2024

• Fixed a bug that caused a YouTube video to automatically restart after playing to the end.

ver. 5.17 - 11/05/2024

• Improvement in chart editing:
  • Added a 1/30 second skip button and rearranged the order of the control buttons.
  • Changed the 1 bar skip button to PageUp / PageDown instead of Shift + Left/Right.
  • Added a button to turn on/off the feature that moves notes on the screen when using touch controls, and made other usability improvements.

ver. 5.15 - 11/02/2024

• Improved display of the Recently Played/Recently Edited charts list
  • The most recently played charts are now at the top
  • Only the first five charts are displayed, and the rest can be displayed by pressing the "Show All" button

ver. 5.14 - 10/31/2024

• Added display of play time during play

ver. 5.12 - 10/30/2024

• Added version number and update history.

ver. 5 - 10/20/2024

• Implemented time signature changes

ver. 4 - 10/11/2024

• Added the ability to create multiple levels per chart

ver. 3 - 10/07/2024

• Added a code editor and a Lua notation system

ver. 2 - 09/29/2024

ver. 1 - 09/25/2024