Adding an alert of some sort, that we've gotten all possible rewards from a challenge, would be great. Twice now I've only gotten shards from the million challenge, finishing it at godlike. Having that one change color to alert me it's all 'played out' would be awesome.
How long do you have to play this game before you can see the auction, anyway? I've been playing for a while, but the auction and the syndicate are still nope options to travel to. :p
 "Get A Little Gold"){kind=icon}
 "Critter Forge"){kind=icon}
Probably will be implemented in one of the future updates.