There is only one bonus round available in the Empty the Bank online slot, but it is a great one. There are no free spins on offer here, instead, there is a respin round which is triggered by landing three or more of the bonus symbols in the game.
When this happens, you will be transported to another screen, where you will see a 7x7 grid stylized like a bank vault. When the game starts, only the central 4x5 grid will be unlocked. The winning symbols from the main round will be locked in place, and you will get three respins. If you land one of eight different bonus symbols in this round, the respins will reset.
Each of the bonus symbols does something different. The money symbol is a multiplier, the walkie talkie adds 2x stake to the value of all symbols for remaining respins, the computer symbol does similar, but it also pays out 1x stake reward, the burglar collects the value of all cash amounts on display, and it opens several new positions on the grid. The alarm is key as it ups the number of respins from 3 to 4, the drill rewards a stake payout and opens a new position, the hammer does the same, and so does the ladder. The only difference is the ladder opens different positions on its first and second landings. Finally, the safe door is the big one, paying out the game’s max payout of 10,000x stake if you land three of them.
The game does give you the chance to increase the possibility of triggering this round using an ante-bet feature.