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You are currently in "fly" controls. To move the camera in [direction] use the following "key" : [left] "a", [right] "d", [forward] "w", [backward] "s", [down] "f", [up] "r". Hold "shift" with any of these to reduce the speed. Increase or decrease the default speed by pressing "+" or "-". You can also use the mouse left-click + drag to control the camera pitch and yaw. To exit fly controls, hit the "space" bar.