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. The new slot machines are easy to recognise because of their distinctive sign package – look for a heap of gold above the slot machines!