| Feature | Original Flash Isaac (Unblocked) | The Binding of Isaac: Rebirth | | :--- | :--- | :--- | | | Adobe Flash (laggy, lower framerate) | Custom engine (smooth 60 FPS) | | Graphics | Lower resolution, fewer effects | Pixel-art overhaul, better animations | | Content | 100+ items, 7 chapters | 500+ items, 15+ chapters (with DLC) | | Multiplayer | None | Local co-op / Online (Repentance) | | Save System | Basic | Robust cloud saves |
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