On one of the levels I had to pass, the way to do it is to wait for 3 yellow keys to spawn in one corner so they release 2 "frozen" keys that are at the end of the line (you can't destroy those hold keys because they are protected by a blocking wall and they hold the release of the 2 slots where the ducks should fall… to…
It was interesting, but a few issues with the way the event was done: 1) The rounds need to be shorter. 3 Days of competing (or more) means that if you play alone you are in a disadvantage with people who seem to be working in teams or at least two…you end up having to sleep at some point, and you can't keep up with them…