In AbaCruX there are 5 possible solution levels that are displayed to the right in the configurations table. They range from one to five stars and are awarded automatically at the end of each game. In order from one to five these stars denote the following:
There are several settings available for the game. You can silence the sound, adjust the selection magnification or reset the solution status for all puzzles. The latter is undoable, so take care with this one. Selection magnification refers to how large the piece you are dragging is getting. On an iOS device someone with bigger fingers might want to set this to the extreme right, so the selected game piece remains visible under one's fingers.