Every now and then, the folks over at Electronic Arts offer up one of the games in their Origin library free of charge, in a campaign called Origin on the House. For the most part they have offered old classics, and now the time has come for Theme Hospital.
Theme Hospital was originally released in 1997, and as the name suggests you get the pleasures (and stress) of running a well-oiled hospital delivered to your door (or rather your PC screen).
The offer is only valid for a limited time, so if your feeling nostalgic you should head over to the Origin Store sharpish.