This will swing the hammer and destroy the gate. You do this by pressing (PS4) / (Xbox One) – coordinates: 3208, 306.

Use Shao Kahn’s Hammer on the half-broken gate, right behind where you picked it up. There you find Shao Kahn’s Hammer on an altar (coordinates: 4459, 250). Now that the big gate is open walk forward until the end of the area. This also opens the big gate in front of you. Make sure you open both of them to get 100,000 koins for free. Each one contains 50,000 koins and 100 hearts. After the initial cutscene there will be two chests in front of you.