So far I've gotten to level 7. I'm enjoying it but the constant throttling is a pain. Assuming they don't have enough keys to add more, my suggestion for the builders would be to at least prioritize requests by the level you are on. Atleast this way you aren't turning off those who have gotten invested and you will be more likely to get useful information on how people are cracking the hardest scenarios. Also, perhaps add a delay upon an incorrect answer until they can try again, to minimize spamming and congestion.
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