Just had a breakthrough game on my Pro this afternoon after spending some time getting to better understand the rules and experimenting with strategies. 1.8B was my top for the last 3 months and hadn't sniffed collecting more than 4 gems in a game. Today's game - collected all 6 gems, trophy mania, computer frenzy, BOM, Battle Royal, Battled Thanos w/out losing a gem, defeated Thanos and hit just about everything else. Thanks AllenLeper for the guidance!!! 3.7B is the new neighborhood record!
The only question I have is if you reach the final Defeat Thanos mode with all 6 gems, do you automatically defeat him and don't have to actually do anything? That's what happened to me and it was a little underwhelming. I got my 1B points but there wasn't an final battle mode.