The patch will be free to all owners of the title, and brings a significant amount of new content to the title including a brand new chapter–unlocked after killing mom 10 times–an additional “FINAL” ending, and an unlockable character.
New enemies, bosses, items, achievements, music, and more on top of everything else. I think you’ll find it all summed up nicely in the accompanying release trailer below. Full patch notes too:
BIG HALLOWEEN UPDATE (with no actual lame halloween themes)
- Added chapter 5 (unlocked after 10 mom kills)
- Added 3+ new bosses
- Added 4 new enemies
- Added 20+ new items
- Added one new unlockable character (Eve)
- Added one new “FINAL” ending.
- Added 6+ new achievements
- Added 2 new music tracks
- Added updated collection viewer
- Added 4 new tarot cards (finishig the major arcana)
- lots of small bugs were fixed
- load time fixed
- a few minor item balances
Check out our recently released survival guide for The Binding of Isaac.