Piggy bank is a great way to accumulate such necessary currency in the game — diamonds! Let's have a look at the main points:

• Piggy bank size S capacity — 300 diamonds. The maximum size of Piggy bank is XXL.
• VIP club members have Piggy bank with a larger capacity for 400 diamonds in size S.
• Piggy bank grows when you spend diamonds, upgrade, and optimize your machines. One diamond spent diamonds give you +10 diamonds. Each major machine upgrades & evolves give you +10 diamonds.
• It requires at least 150 diamonds inside to break the piggy bank.
• The full Piggy bank (if it is not opened) will be reset after 24 hours.
• You don't get diamonds automatically when the scale is full. You will still need to break it for money.