The daily blind ranking game
Peekle deals you 8 items one at a time, and you drop each into a slot from 1 to 8 before seeing the next. Once it's in, it stays. Then the real order is revealed. One puzzle a day, the same for everyone, with various themes. Free, no account.
A source that found nothing is a measurement. A source that has not run is a gap. Neither means the launch lacks the thing.