Warmup on new levela unfair!

no you cannot

Yes, you can. And I've shown you screenshots. 😃

Although it's possible, it's too much trouble, as you'd need at least 85 levels, and the reward is not really worth it. The life limitation is another obstacle.

I'll repeat how it's done: if you have an old level with just 1 star and you do it again and get 3 stars, the difference of 2 stars goes towards the warm-up task. Obviously, you can only do this once per level. ☺

I did 3 episodes of new levels (1 episode per day). That's a maximum of 135 stars. The rest - over 35 stars - came from lower levels I managed to do better. Some were just too hard to complete with 3 stars without any boosters but there were enough I never bothered repeating before.

I wish they let max level players go back - like a progress reset but without losing their progress - so they could get resources for hardest levels and not be disadvantaged in such competitions.