Entities offers fewer APIs than Classic. Can I start with Entities and fill feature gaps, e.g. leaderboards using Classic?
Of course, you can do this.
For the moment, Entities only provide new access patterns for current accounts and data systems. It is not yet a complete replacement for Classic APIs. Moreover, using Entity API in the same game will not change the behavior of the existing APIs, You can safely use them both at the same time.
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