The phrase "piece" in the context of a The Binding of Isaac: Repentance save editor likely refers to the save file icon puzzle
Disclaimer: Turn off Steam Cloud sync temporarily before doing this. Steam will overwrite your manual edits if you don't. The Binding Of Isaac Repentance Save Editor
Using a save editor for The Binding of Isaac: Repentance allows you to bypass the game’s extreme grind by manually unlocking secrets, editing character "post-it" completion marks, or adjusting machine coin counts. Because Repentance uses a checksum to verify save integrity, you must use a dedicated tool or script that updates this checksum, or your edits will be ignored or lead to corruption. The phrase "piece" in the context of a