.ESG files are saved game files that are created within 'Enigmo' (and 'Enigmo 2'), a three dimensional puzzle game for various platforms. In 'Enigmo', the player directs droplets of liquid to its proper container. .ESG files save the 'Enigmo' player's current progress, and the game's current state, so that the game can be resumed in its current state and level of progress at any point in the future.