Original: However , the distinction is not clear-cut , and many games are also considered to be work ( such as professional players of spectator sports\/games ) or art ( such as jigsaw puzzles or games involving an artistic layout such as Mahjong solitaire , or some video games ) .
Simplified: In his Philosophical Investigations , Wittgenstein demonstrated that the elements ( parts ) of games , such as play , rules , and competition , all fail to correctly define what games are .