what is a power stone in phlinx 11?

A power stone is the power ups that you get for free in the daytime part of the game.  Without knowing the requirement for what you are working on I’ll hazard a guess that you can use the tutorial to complete the challenge.

Thanks for that tip.  I would have never thought you could use the tutorial on dropping of 28 powers on GOTM.  Went really fast after starting with just 1 per game.

You’re very welcome!