Today's Connections puzzle is particularly challenging

The New York Times Connections puzzle for March 15th features 16 words that players must sort into four categories. Today's puzzle is noted as one of the hardest yet, differing from previous easier versions. The categories for this puzzle are: Yellow - Sharp Protrusion, Green - Features of Stringed Instruments, Blue - Litigation Verbs, and Purple - In “Star Light, Star Bright.” The words sorted into categories are: Yellow - Barb, Bristle, Needle, Spine; Green - Bridge, Neck, Peg, String; Blue - Charge, Move, Serve, Sue; Purple - May, Might, Tonight, Wish.