They should make shard tourneys and increase the max shards. Especially for those who might want to gamble on tourneys to quickly increase their shards. Earning 2-4 shards a day is too slow.
@Atomic_Pope All the maps that are related to the challenges have ! beside them. If you hover over the !, it'll tell you what the challenge for that map is
Anyone else have a problem with the achievements? I earned all the achievements and got all the prompts and you've earned blah blah stuff but when I came back to the game apparently I haven't completed the game and earned all the challenges as I look at my profile that shows me having all the challenges
 "Epic Battle Fantasy 4"){kind=icon}
 "Tyrant"){kind=icon}
 "Takeover"){kind=icon}
 "Demonrift TD"){kind=icon}
 "Kamikaze Pigs"){kind=icon}
 "Hands of War Tower Defense"){kind=icon}