I made it to level 39 before I realized that clicking the errors button in the lower-left will highlight the said pieces....great game, even though it took longer than I care to admit.
Simple yet enjoyable. Leveling up actually feels more powerful, and I cannot wait for more. Tip: Farm the silver cup for quick gold gain, if you wanna be op quick
 "Maptroid"){kind=icon}
 "Four Color Theorem - Coloring Puzzle Game"){kind=icon}
 "The Dark One"){kind=icon}
 "yellow"){kind=icon}
 "CycloManiacs"){kind=icon}
why not both?