The final artifact will be found in the sewer beneath the Tower of Nicholas. Instead of heading through the big metal gate, go across the bridge (next to the sleeping guard) and break down the wall with a nearby sledgehammer. Head into the room behind it to find the Bronze Mirror at the end of the path.

There are numerous ways in which you can speed up your progress in Indiana Jones and The Great Circle. These include a handful set of skills that you can unlock with the help of Adventure Points, and performing unique methods to make your way through the different regions and scenarios.

Indiana Jones and the Great Circle exploits Indy's fear of snakes and, just when it overstays its welcome, it culminates in a horrifying boss fight.