Daily Challenges

[Hipoo]

I like the idea. But if you really want to promote group challenges, either don't reward duos or do something like 2N rewards per day with N duos and N groups. Else players will just start pairing up with someone and doing all their daily challenges together in duo, it can happen with a group of 6 too but it's not as easy to coordinate. (I see the potential of this increasing the usefulness of guilds too, which is also a plus)

And for rewards, 1 diamond probably won't be appealing for high level players (extra 3~5/day won't help them much). Instead of a scaled down rando code, maybe a regular rando code after you complete them (which is usually a useless tiny pack bad but has a chance to be decent).