In the shop in Greed Mode there is a Recycling box that you can donate coins into. What does it do?
I put some in but didn't notice any difference.
The Binding of Isaac – What Does the Recycling Box Do?
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Related Solutions
It won't unlock anything, all you can do is use it as a bank for future runs.
The blowing up was not caused by adding your 999th cent, that was because you got it to 1000 cents.
So in a way you are wasting your money (if you donate money instead of buying stuff anyway), in a way your are giving later runs a potentially bigger chance for buying items (assuming you bomb the machine in that run).
The blog post introducing Greed Mode lists all possible locations for Super Secret Rooms in Greed Mode:
- above the Shop
- to the right of the Treasure Rooms
- to the left of the Cursed and Devil room
- below the exit room
It doesn't mention normal Secret Rooms, so I think there are none in Greed Mode.
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Best Answer
It's a Restock Box. Blowing them up or putting enough coins in the rerolls all the items in the shop. They can also spawn in item rooms, where they will reroll the item.