Unreal Tournament 3
The Ball: Pehua is a first person singleplayer puzzle mod with an Aztec theme to it. The mod takes place in a mysterious Aztec temple which has only been discovered recently, at the top of a volcano.
The Ball offers an adventure that puts you in the boots of an explorer who gets stuck in a cavern and bumps onto an ancient complex holding a mysterious ball.
The 4th episode of The Ball. Venture deeper than ever into a volcano and come across an ancient vehicle that will take you across a vast desert lit up by an ancient lightsource. Non linear gameplay!