In order to make things happen, Players execute Activities.
These Activities can be completely on-chain, automatically exchanging Consumables for other Consumables. For instance, a Perform Magic activity could consume Magic Energy in exchange for Magic Experience.
Or, they could trigger off-chain capabilities in your own software. For example, every time the Buy Ticket activity is used, it could consume Airline Miles on-chain and your company can provide the airline ticket off-chain.
In addition to requiring Consumables to complete, Activities can be restricted so that only Players with specific Skill Levels can execute them. For example, the Perform Advanced Magic activity may require the Advanced Magician skill.