What does the donation machine do?
I found a donation machine in a shop.

What does it do apart from take my money, if anything? I noticed it seems to break after a few coins.
Best Answer
Donation machine can unlock certain items and upgrade your shop, allowing it to sell more items.
List of unlockable stuff:
- 10 Coins: Blue Map
- 20 Coins: Shop Upgraded to level 2
- 50 Coins: There's Option (An Item)
- 100 Coins: Shop Upgrade to level 3
- 150 Coins: Black Candle
- 200 Coins: Shop Upgrade to level 4
- 400 Coins: Red Candle
- 600 Coins: Shop Upgrade to level 5 (Last level for the shop)
- 900 Coins: The Candle
- 999 Coins: Stop Watch
In the Afterbirth DLC, you can also find the Greed Machine, which can unlock items and achievements. It appears after Ultra Greed Fight
List of unlocks from the Greed Machine:
- 1 Coin: Lucky Pennies
- 15 Coins: Special Hanging Shopkeepers
- 33 Coins: Wooden Nickel
- 68 Coins: Cain Now Holds Paper Clip
- 111 Coins: Everything Is Terrible 2
- 234 Coins: Special Shoopkeeper
- 439 Coins: Eve Holds Razor Blade
- 666 Coins: Store Key
- 879 Coins: The Lost Now Hold Holy Mantle
- 999 Coins: Generousity Achievement
- 1000 Coins: The Keeper Is Unlocked! (It's a character)
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What happens if you donate 1000 coins to the Donation Machine?
If Isaac attempts to donate a 1000th coin, the Donation Machine will explode, resetting its total to 0 and dropping roughly 12 dimes.What does the greed donation machine do?
Upon touching the Greed Donation Machine, Isaac will donate a coin, causing the displayed coin total to increment. Similar to the Donation Machine, the amount of coins donated will persist between all Greed mode runs. Donating money to the Greed Donation Machine unlocks achievements and items.How do you make a greed machine not break?
To fill the greed machine easily:How do you max out a greed machine?
Here are some of the things I used:Rebirth tip - How to fill the Donation machine quickly!
More answers regarding what does the donation machine do?
Answer 2
In addition to upgrading the shop, you can also use a bomb on it to get some coins out of the donated money pool. Especially useful if you only need a few coins to buy that shop item.

It seems that using a bomb "destroys" some coins
Answer 3
I noticed that the number of coins donated remains from run to run, and when it reached 10 I got the secret "The Blue Map has Appeared in the Basement!" Hopefully this helps.
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: RODNAE Productions, RODNAE Productions, Michael Burrows, Gustavo Fring
