Add Daily_challenge

wiki/Gameplay/Daily_challenge/en.md

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+# Daily challenge
+
+The **daily challenge** is a multiplayer mode in osu!(lazer) where players are able to build up a daily streak by passing beatmaps consecutively with increasing difficulty with the difficulty being reset every 7 days.
+
+Every beatmap is handpicked from the [Featured Artist](/wiki/People/Featured_Artists) listing, and sometimes the maps come with a mod forced onto users, which requires them to pass the map with the selected mod.
+
+## Game menu
+
+From the main menu, the daily challenge menu can be accessed with the following steps:
+
+1. Click the `play` button or press `P`.
+2. Click the `daily challenge` button or press `D`.
+
+![](img/daily-challenge-menu.png "Screenshot of the daily challenge menu during November 7, 2024.") 
+
+On entering, the user is presented with an intro showing the beatmap the user has to pass, and the mods they have to pass it with.
+
+After the intro ends, the user can view the data for today's challenge. The left side displays various score-related information like the total pass count and the cumulative total score. In the middle, a leaderboard shows the top scores achieved by players. Users are able to discuss the daily challenge in the chat on the right.
+
+## Beatmap difficulty range
+
+![](img/Beatmap-selection-criteria.png "Specific star ratings beatmaps have to follow for the entire week")
+
+## Streak milestones
+
+Play streaks are displayed on the user's profile with different colours depending on certain streak milestones:
+
+<!-- tier images: https://www.figma.com/design/tc79qAgJ35KQvdTO0Oj3dN/Daily-Challenge-Counter?node-id=0-1&t=xjRm9Ke0tUMtAQlh-1 -->
+
+|  | Tier | Total participation | Daily streak | Weekly streak |
+| --: | :-: | :-: | :-: | :-: |
+| ![Lustrous tier](img/tiers/lustrous.png) | Lustrous | 1080 days | 360 days | 53 weeks |
+| ![Radiant tier](img/tiers/radiant.png) | Radiant | 720 days | 240 days | 36 weeks |
+| ![Rhodium tier](img/tiers/rhodium.png) | Rhodium | 360 days | 120 days | 19 weeks |
+| ![Platinum tier](img/tiers/platinum.png) | Platinum | 180 days | 60 days | 10 weeks |
+| ![Gold tier](img/tiers/gold.png) | Gold | 90 days | 30 days | 6 weeks |
+| ![Silver tier](img/tiers/silver.png) | Silver | 30 days | 10 days | 3 weeks |
+| ![Bronze tier](img/tiers/bronze.png) | Bronze | 15 days | 5 days | 2 weeks |
+| ![Iron tier](img/tiers/iron.png) | Iron | less than 15 days | less than 5 days | less than 2 weeks |
+
+## Contributors
+
+The project is organised by ::{ flag=TN }:: [Hivie](https://osu.ppy.sh/users/14102976). The following community members are responsible for picking beatmaps:
+
+- ::{ flag=US }:: [ChillierPear](https://osu.ppy.sh/users/9501251)
+- ::{ flag=BR }:: [Dada](https://osu.ppy.sh/users/9501251)
+- ::{ flag=DE }:: [FuJu](https://osu.ppy.sh/users/10773882)
+- ::{ flag=KR }:: [momoyo](https://osu.ppy.sh/users/12469536)
+- ::{ flag=GB }:: [kingling](https://osu.ppy.sh/users/7010761)
+- ::{ flag=KR }:: [Luscent](https://osu.ppy.sh/users/2688581)
+
+## Trivia
+
+::: Infobox
+![](img/yt-comment.jpg "waxxx14's YouTube comment suggesting the \"cup of the day\" format")
+:::
+
+- The idea for daily challenge was taken from a comment from waxxx14 requesting a "cup of the day" format from [TrackMania](https://en.wikipedia.org/wiki/TrackMania) in osu!, posted under the lazer development video ["deciding what to do with lazer"](https://www.youtube.com/watch?v=xUSxEjQQ1UI).
+- The daily challenge launched to the public on July 25, 2024 in osu!(lazer) public release [2024.725.0](https://osu.ppy.sh/home/changelog/lazer/2024.725.0) solely for the [osu! game mode](/wiki/Game_mode/osu!).
+- In the initial release, free mods were not selectable, and the total pass count as well as the cumulative total score were only added in a later update.