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My first guess was trilobyte fossil but then I re-read the post text (eyes tend to skip when they're tired :) so I edited it.

but this time no more answers till the end of payout.

wouldn't the game turn into "who comments first" then?

@onceuponatime held some similar games, with fixed reward.

Still experimental at this stage... lets see where it goes... perhaps I will work towards a powerdown jackpot