Dungeon Defenders 2 will be free when it launches as a full game on PlayStation 4, but fans who want to play it as soon as possible, pre-alpha bugs and all, can pay for the privilege starting next week. The pre-alpha version of Dungeon Defenders 2 -- that's a version that the developers are still building -- will be available for purchase on PS4 on September 29th in three packages: $15, $25 and $75. These are three bundles offering different in-game goodies for die-hard (or simply curious) fans, and they're identical to the ones offered on Steam Early Access.