Block Blast deals an unwinnable 'lethal puzzle' when you beat your high score and the loaded ad is worth 3.5x your last one, a decompile shows
Data scientist Ayo Omolewa took apart Block Blast on Android and iPhone and published the code: a downloaded rule waits for three good rewarded ads, a loaded ad priced at 3.5 times the last one, and a score 1,000 past your record, then asks for a hand no placement can finish.