you can piggy bank on it

Crack open the vault in You Can Piggy Bank On It.

Landing 3, 4, or 5 scatters triggers the bonus game with 10, 15, or 20 free spins. At the beginning of the feature, the vault sitting atop the grid opens to reveal 14 money symbols with values of up to 10x.

If a TNT wild symbol hits during free spins, it awards all visible money symbols on the grid and adds a pig symbol to the centre position. All money symbols in the vault are awarded, the values in the vault are randomised, and the centre position respins. If a pig symbol hits, the vault money symbols are collected again, or if a police symbol hits, the round ends.