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Which part are you referring to?  I made all of this without hacks.

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To activate the last chamber you move a sprite (maybe a plug) to a corner, then the chamber change to active (i can enter).

How you can change sprite states in the same room?

Sorry my english.

The battery that you move is actually a non-wall tile which is on top of a teleport to another identical room where the tile has been moved.  It requires many many rooms and many duplicates of NPCs.  It is time consuming but the result is a bit more interactive than what is typically seen in Bitsy.

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Thanks !