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You don’t. This would need to be simply a single-step achievement.


If your game requires a server anyway, then the most platform-independent method is indeed to store savegames server-sided and use accounts with passwords to synchronize savegames between devices owned by the same person. Accessing the savegames on the server could be done via a webservice.


An update for the first week of 2020's: Cocoonjs was probably a solid solution for this issue in the past but they are shutting down.. a quote from their official web site that says it all It is with deep regret that we announce that we will stop providing our beloved service, Cocoon. We started Ludei/Cocoon because we believed the future of app ...

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