Piggy Bank

The Piggy Bank was introduced in 2.4; it provides an opportunity to buy gems at a discounted rate (if you fill the piggy bank, you can get 2.5x Gems compared to what you would normally get for that price in the shop).

There are different levels of piggy banks as follows, and opening up one piggy bank unlocks the next one.

Level Coins Needed Gems Price (USD) Gems/$ Gems/$ in Shop
Plastic 40 1,200 2.99 400 160 (320 for 1.99)
Bronze 40 2,500 4.99 500 200 (1,000 for 4.99)
Silver 50 6,000 9.99 600 240 (2,400 for 9.99)
Gold 50 12,500 19.99 625 250 (5,000 for 19.99)
Platinum 60 32,500 49.99 650 260 (13000 for 49.99)
Diamond ?? 70,000 99.99 700 280 (28000 for 99.99)

Note that because you need to spend on the less attractive lower tiers before you can get to the higher tiers, the difference between Piggy Bank and BOGO isn’t as big as you might expect. So it’s more like 8~11% better rather than x2.5 vs x2 and is only cheaper if you unlock at least the Silver Piggy Bank:

Highest Level Cumulative Gems Cumulative Price (Rounded) Effective Gems/$ Comparable BOGO
Plastic 1,200 3 400 400 (1,000 x2 for 5 $)
Bronze 3,700 8 462 480 (2,400 x2 for 10 $)
Silver 9,700 18 539 500 (5,000 x2 for 20 $)
Gold 22,200 38 584 520 (13,000 x2 for 50 $)
Platinum 54,700 88 622 560 (28,000 x2 for 100 $)
Diamond 124,700 188 663 N/A

Notes:

  • Prices are shown in USD; the actual prices can vary by country but you would get 2.5x Gems that you would get for that price in the shop
  • It is possible to open up the piggy bank even when it is not full, but then you don’t get the same benefit so it would be a waste. Also, I haven’t tested to see if opening an incomplete piggy bank still unlocks the next tier. In any case, if you are playing often enough to want to buy gems, you shouldn’t have a problem filling up the piggies