You are trapped in prison for a crime you did not commit. Falsely accused and incarcerated, but never giving up and planning your own release. You persevere day after day, year after year. Hope can set you free. Finally, you can breathe the air of freedom.
Use the arrows or WASD keys to move, the space bar to jump, Shift to run, Q to do a somersault, the mouse to aim and shoot, 1-2 to switch weapons, and L to show or hide the cursor.