NPD Group is a good resource for market information and they have recently released how they classify video games.
They have done a good job of breaking down the game content and monetization models that exists in the gaming industry. Their categorization makes sense to me and I don’t see anything that has been overlooked.
The high level classifications are:
- Video game category
- Industry segments
- Channel (purchase)
- Delivery method
- Business model
- Payment method
See the flow chart below for details.