Draw lines between pearls to make a branching network with no loops that leaves out no pearl.
Pearls are either shaded or unshaded.
A grey pearl is either black or white, and you need to figure out which. Black and white are the only actual colors of pearl.
Though the solver is not told which, one pearl is designated as the "center" pearl.
The center pearl bears a number equal to how many opposite-color pearls it's connected to (same-color pearls may not connect) by lines, which may not be all of them.
Those pearls then have numbers (unless they're dead ends) saying how many opposite-color pearls (other than the one they came from) they're connected to, and so on.
A numberless pearl has only one connection--its parent.
Lines may not cross.
UnshadedShadedGrey
Breaks rule 1: Draw lines between pearls to make a branching network with no loops that leaves out no pearl.
Breaks rule 4: Though the solver is not told which, one pearl is designated as the "center" pearl.
Breaks rule 5: The center pearl bears a number equal to how many opposite-color pearls it's connected to (same-color pearls may not connect) by lines, which may not be all of them.
Breaks rule 6: Those pearls then have numbers (unless they're dead ends) saying how many opposite-color pearls (other than the one they came from) they're connected to, and so on.
Breaks rule 7: A numberless pearl has only one connection--its parent.