The multilevel jackpot system Fort Knox is named after the famous American bullion depository. When a Fort Knox bonus game is triggered bells ring and respective symbols appear on the display. The jackpot system has four levels: Copper, Silver, Gold and Platinum. A bonus game is triggered regardless of a combination and stake, always starting from the Copper level. Players choose from a grid of safes and move forward to a higher level or return. The higher the level, the higher the bonus wins. The highest Platinum jackpot starts from 10 000 euros. The new slot machines are easy to recognise because of their distinctive sign package – look for a heap of gold above the slot machines!