Wow... I have been waiting for a mode like this... and what peppy said sounds positive!
RandomIdeas from another thread.
Random involves using every single song in your library.
You can configure what kind of difficulty you want to play based on stars (ex. range of 2-3.5 star songs only).
You can choose how many songs you want to play in a row (ex. infinite, 10, etc.)
You can choose if you want to play more than 1 map from a mapset (ex. play the same song more than once)
Shuffle through your favorite artist's songs. Only their songs will be picked. Same configurations as Random.
Setup a playlist of songs you want to go through. You can select mods to be enabled on the songs you choose, and then promptly disabled/changed on the next.
Daily Challenge has 4 difficulties: Easy, Difficult, and Intense.
Easy consists of 3 ranked songs ranging from 1 to 2.5 stars. No mods will be enabled by default, although you can add some.
Difficult consists of 4 ranked songs ranging from 3 to 4.5 stars. Some mods will be enabled, however you can turn them off (unranked on daily challenge leaderboards, however).
Intense consists of 5 ranked songs ranging from 5 to 7 stars. Mods will probably be enabled on all songs. Again, turn offable. However, just for the hell of it, you could make it so you can't turn it off. Due to the amount of difficult songs though, mods may not be a good idea.
Leaderboards will show who has the top score on all overall songs for the challenge. Leader by the end of the day gets osu!direct for the next day, and a counter will be on their profile showing how many times they've gotten to 1st place. If the player is already supporter, nothing happens. An announcement on #announce will show who got #1.
A optional idea would be to vote to see what songs would be picked for the next challenges. However, once a song has been voted to be chosen, it won't be able to be chosen until next month. (if it's bad enough it could be next year?)
Couldn't find anything similar on search, so thought I'd bring this up.
Unsure how well this idea would work, but it seems challenging and fun for all. What do you guys think?