The original Flash version of The Binding of Isaac today received the Eternal Edition update which adds Hard mode, “eternal enemies,” and various bug fixes. The Eternal Edition update is out now on Steam and requires the Wrath of the Lamb expansion to play. Mac users will have to wait another week for this update.
Florian Himsl, co-developer for The Binding of Isaac, is the creator of this update and has published a video showing two eternal enemy boss fights. It is important to note this version of The Binding of Isaac is different from the one on both consoles and PC, The Binding of Isaac: Rebirth.