Sign up to receive each week’s Playlist e-mail here! Also check out our full, interactive Playlist section. Undertale (PC, Mac) BY Toby Fox You might say Undertale is unique due to its passive battle system. Certainly, allowing you to choose whether to flirt or fight with every monster you encounter is unconventional for an RPG. But what makes Undertale a truly notable title is how it makes metaphors out of mechanics. Most videogames give you a sword, creatures to kill, and a reward for doing so. There’s not a lot of room for interpretation. Undertale, mimicking real life, renders conflict a puzzle to be finessed and solved…