This patch fixes a bug that could erase chapter progress, and corrects the difficulty-clear achievements, which were unlocking one tier too high.
Bug fixes:
- Fixed a bug where replaying a chapter you had already completed (for example, to clear it again on a higher difficulty) could wipe your progress in later chapters and lock you out of them.
- Save files affected by this bug are now repaired automatically the next time they load. Restored chapters keep their difficulty clears; the star ratings of a fully wiped chapter may need to be earned again.
- Difficulty-clear achievements now unlock at the correct tier. Previously, clearing a chapter on Extreme unlocked the Lunatic achievement, with every other difficulty achievement shifted up by one in the same way.