The Lost Temple is a Level Design and Set-dressing project made in UDK.
You play as an explorer spelunking an ancient temple in the jungle. For reasons unknown, the temple has remained mostly intact despite being incredibly old. You discover a way in, and learn that the reason for the temple's structural integrity is an advanced unknown power source. The ancient humans built this in cooperation with someone, or something, else. You must pass the temple's trials to earn access to the power's source.