Bulletstorm
Grade: D
To disable hud, open C:\Users\username\Documents\My Games\BulletStorm\StormGame\Config\StormHUD.ini with Bulletstorm inieditor (from here ) and edit like on screenshot:
Bulletstorm Ini-editor
To disable crosshair by pressing button "Y", download the file from here and read short instruction.
Bulletstorm Nohud