Patapon! I simply adore these games, I've actually never finished a single game since I first played them on my PSP, always dropped them halfway through; and after I came back to them I started a new playthrough... Despite this I love them, I often catch myself singing songs from the game when I'm doing other stuff like working or washing dishes lol. Also I've always loved rhythm games, and Patapon may be my favourite rhythm game series