Download Zenith from here, learn the game objective, and about the game's origins and design.
How to Play
Detailed instructions on how to play: the landscape, movement, objects in the game and how they behave, what keys to press, and when to run away!
Learn to play better. Reading this is cheating!
Player's Guide: Key Reference
Keys that perform actions while you play Zenith
Command reference for the Command Console
News and development history
Screenshots of Zenith
Frequently-asked questions about Zenith
Design Choices (devblog)
A developer's insight into creating a game for raw gameplay. Explains some of the (mostly conservative) design decisions.
Programming Zenith (devblog)
We look at some of the techniques used to implement the gameplay. This might help developers thinking of writing a game based on The Sentinel.