Will files created in earlier versions of Phaser work in the current version?
Yes. Phaser Project Files (.ppf) and Phaser Gallery Files (.pgf), and any Custom Equations created in Phaser 2.1 will work in Phaser 3.0. The current version is backwards compatible with earlier file versions. However, the converse is not true; that is, files created in 3.0 will not necessarily work in 2.1.