It's literally impossible to pick the 'real' murderer in Pentiment because Obsidian never considered having one: 'You're not a detective, you're a f***ing artist'

Image of illuminated manuscript-style drawings from the game Pentiment.

Obsidian's Pentiment is one of the most interesting games of the last several years. Set in 16th-century Bavaria, the game tasks you—journeyman artist Andreas Maler—with figuring out who keeps doin' murders in the town of Tassing. There are plenty of potential suspects you can point the finger at, and you have to choose one whether you've got damning evidence or not.

Spoiler: you will never have damning evidence. Regardless of who you send under the headsman's axe, you'll always have a queasy feeling that they might not be the one who did it.