A data processing apparatus includes: receiving circuitry to receive game state information and associated user data for a plurality of previous interactive sessions of an interactive gaming application, the plurality of previous interactive sessions associated with a plurality of users, wherein for each previous interactive session, the user data is indicative of one or more properties for a given user during the previous interactive session and the game state information is indicative of one or more in-game properties during the previous interactive session; analysis circuitry to: generate user emotion data indicative of one or more user emotion categories in dependence upon the user data for the plurality of previous interactive sessions; detect a correspondence between a set of one or more in-game properties and a given user emotion category for at least a threshold number of interactive sessions; and generate a notification element comprising notification data indicative of the set of one or more in-game properties; and storage circuitry to store the notification element.