One of the best FPS shooters ever. With 'shooters' in the true sense of the word. In case you don't know, it comes with the Masters Levels too.
A really fun game that is so good theres even a open source remake of it called CorsixTH. CorsixTH requires the original art and music assets to work. So this is where you still need to buy it in GoG. CorsixTH will enable you to play this game on OSX, Linux and Windows with a more updated UI and updates the game to work on more modern specs. With CorsixTh you can bring up a cheat menu in Theme Hospital by typing 24328 into the fax machine. Theme Hospital is a really fun hospital sim and one of the best sim games made by Maxis.
