Carrion Fields is not 'free to run', because someone has to pay for the server and bandwidth. They can get someone else to foot the bill or get the players to send donations to the hosting provider - but even if the owners themselves end up paying nothing, the mud hosting service is still not 'free'.
However it is completely 'free to play'. As a customer, there are no aspects of the game which are unlocked with real-life money.
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