Abstract: An audio visual game system comprises a data repository, a processor, an output module and a user interface. The data repository encodes caption data associated with audio-visual data, the caption data corresponding to at least a part of the audio data. The processor is configured to execute computer program code to generate one or more omissions in the caption data and cause the caption data including the one or more omissions to be included in a rendering of the visual data to produce captioned visual data. The processor is further configured to execute computer program code to cause output of the captioned visual data synchronized with the audio data to a user via the output module and to receive a user input via the user interface on the one or more omissions and award a score in dependence on said user input. An associated computer implemented method is disclosed.