Machinarium

Machinarium is award-winning independent puzzle / adventure game developed by the makers of popular web-games Samorost and Samorost2. A little robot who’s been thrown out to the scrap yard behind the city must return and confront the Black Cap Brotherhood and save his robot-girl friend.

Minimum system requirements: 

CPU: 1.8 GHz (x86 compatible)
RAM: 1024 MB
HDD: ~380 MB