The Ammo Level Up feature in Leprechaun Heist is a great way to, well, level up! Especially as you go through the free game rounds as it will offer you the opportunity to follow a similar process to what was mentioned in the Heist Free Games section. To make it easy to understand, it comes into play on every fourth win, meaning at the point of four wins, eight wins, 12 wins, and 16 wins, you will level up into a different round each time.