I wonder if they made them impossible on all tries except the first one by accident. I've never been able to do these any of these with a 7-second malus. However, I was able to do the hoe challenge with grass (lmao) with a 5-second malus once, it was yesterday.
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This one is SO random that I sometimes barely get it in 60 seconds, while I was able to complete it with a 10-second malus multiple times. Had to get very lucky with the spawns.
By the way, I have a question for you. Is there a known way to manipulate which game you get? Cause there's no point in trying to win with a malus in some modes, it'd be very handy to be able to just skip those.