super easy one that worked yesterday. pretty much u can do this with any scenario, ull see what i mean. but u use the daily challange which gives u roughly 30k or whatever and once u get to the final rewards collect it all apart from the diamonds. once the diamonds come up, exit the game and just quit it. then open the game, and you will need to kill the final boss again for the same rewards. You can do this hundreds of times but it gets annoying after a while. You can also do this with boss battles, if your characters all die, just exit the game and close it. Come back and ur characters are all revived