The Save plugin enables you to securely save application data such as game high scores, achievement progress, and persistent settings/configuration. The secure aspect is useful to prevent users from modifying save data in an attempt to cheat leaderboards/achievements or unlock in-app purchases for free.
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Once you've activated this plugin, appropriate build.settings code will be generated for you to copy into your Solar2D project. Download links will also be available for inclusion into a Solar2D Native project.