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5

1 kill == 2 gems worth of upgrade progress Example: For a new hero, it costs 1000 gems to purchase an upgrade from level 1 to 2. Playing this champion for the first time and getting 100 kills will reduce this cost to 800. This is easily testable: Pick a hero that isn't level 3 yet. Tap the upgrade button to see how many gems it will cost to upgrade to ...


5

Yes they do, according to Nimblebit. http://support.nimblebit.com/customer/portal/articles/1074299-upgrading-heroes


5

It's the high score marker....


2

Without rigorous testing or word from the developer, we'll never know. Personally, it seems to act like a weighted random system. I've noticed that you really don't get more heroes than currentLevel+X, and if you have currentLevel-Y heroes, they spawn more frequently to help fill in your numbers. The exact heroes you get, and the order you get them in, ...


1

To my knowledge, it's all random. However, before starting the next round you can add a hero to your party. It costs 1 token, and the button is in the bottom left hand corner of the screen before you start the next level.


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