Abstract: A training game that requires a player to role-play a conversation in which the player is judged according to the player's demonstration of a Hidden Skill. Skills relevant to successful performance in a particular type of conversation (for example, a sales call) are identified. The player is aware that these are the skills the player is expected to learn and to demonstrate. The player is judged, however, as to the player's performance on a subset of the skills. The player does not know which of the skills form the subset on which the player will be judged. By hiding the specific skill being evaluated from the role player, the game encourages the player to perform all necessary conversation skills during the role-play. Only then is the player guaranteed to execute the Hidden Skill. The game thereby trains players in all aspects of the relevant conversation skills.