This document discusses UX principles for serious games. It begins with definitions of serious games as having an explicit educational purpose beyond mere entertainment. Examples are provided such as games for learning statistics, geometry, languages, and skills like patient triaging. The document emphasizes that UX is important for serious games to provide meaningful experiences for players. It recommends techniques like defining player personas, scenarios, and journey maps to align design with players' goals. Prototyping and evaluation methods are outlined. Specific UX principles discussed are engaging players early, using scaffolding supports, and basing game characters on researched player personas.