Some hints for those just play for the medium badge: You need to play missions to earn stars. You need energy to play missions. Besides waiting, you can level up to regain your energy (and stamina). To gain level, you need to select "battle", then close the "PvP brawl". Only battle their will gain you level. Buy Odyssey box at special offer with your starting and rewarded tokens. I bought 6. Remove those cards that are a lot weaker from your deck.
Later objectives should be made more rewarding, like add achievements for them. They are hard to get, some of them get you less idols than usual, and by then 2 or 3 jeweled boxes aren't great enough
 "Songbird Symphony v0.2"){kind=icon}
 "Dungeon Crusher: Soul Hunters"){kind=icon}
 "World's End Chapter 3"){kind=icon}
 "Tyrant Unleashed"){kind=icon}
 "Tabletop idle"){kind=icon}
 "Crusaders of the Lost Idols"){kind=icon}
 "Long Way"){kind=icon}
 "Flagstaff: Chapter Two"){kind=icon}
 "Flight"){kind=icon}
 "Flight"){kind=icon}
 "Champions of chaos"){kind=icon}
 "Bloxorz"){kind=icon}
 "Doodle Devil"){kind=icon}
 "The Extremely Hard Quiz"){kind=icon}
Interesting suggestion. I'll add it to our list of player suggestions to consider.