In the later chapters of Indiana Jones and the Great Circle, “A Game of Wits” is one of the more interesting (and challenging) sidequests you'll come across. Found in the Sukhothai region, “A Game of Wits” is categorized as a Mystery, meaning it's a sidequest basically consisting of just one big puzzle. Specifically, it's located within Voss’ Camp, which means you'll have to do quite a bit of sneaking around Sukhothai before you can even access it.