[Divisible by Waffle]

Okami is so original; while there are some similarities to Zelda (same kind of atmosphere, lots of puzzle solving), it stands alone in the "sun gods that use calligraphy to save Japan from certain doom" genre.

Katamari Damacy is another really original title. I mean, you play as the little green Prince, and you roll a ball into junk that magically sticks to it so. And not just junk; PEOPLE. Rolling up people is probably the most fun thing in that game. It's kind of sick, but in a very satisfying way.

Mario Bros. is original, for its time. Who would have thought to make a game about plumbers fighting off crabs and turtles in sewer pipes? I mean, seriously? It's pretty obvious to make games about spaceships and racing cars. Pac-Man and Tetris also fall into the originality category for this reason.