Anti-cheat is not easy to implement, but first, you should disable the client API’s permission to submit statistics. Simply navigate to [Game Manager] -> [API Features] -> uncheck “Allow client to post player statistics”. Otherwise, modifying API Access policy may also do the job.
The rest of anti-cheat process depends on your game mechanism. For example, you can specify a score range of a level and verify the submitted value. You may also mark the level start time and finished time, to avoid directly submitting a value to your Cloud Script. It will be better to log players’ behavior (game progress in a level) via PlayStream event, and when this player is reported, those events can be the evidence. In terms of reporting system, please refer to my answer in Player reporting system - Playfab Community.
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