Good question CentricCracker! The different color set for some of the levels are because they came from "bonus" sets in the mobile version, and those are magenta-yellow :)
if a qween gets you in check, there is a small chance you move out of check and the qween gets you back in, you move out, she gets you in, and so on, click + if this happened to you, - if not
Good question CentricCracker! The different color set for some of the levels are because they came from "bonus" sets in the mobile version, and those are magenta-yellow :)