I noticed this while I was farming my Battle Pass in singleplayer. I only completed the last challenge, as it was given as follows: Harvest Stone → Craft a Golem → Gather Berries → Craft a Golem → and so on… It consisted of a common challenge and then an Epic one; I never encountered a Legendary challenge.

I set my level to 60, and it started to present different challenges and grades.

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