In terms of game file size, you will need at least 650 MB of free disk space available. An Intel Core i3-530 CPU is required at a minimum to run Expelled. Provided that you have at least an NVIDIA GeForce 7200 GS graphics card you can play the game. The minimum memory requirement for Expelled is 512 MB of RAM installed in your computer. If possible, make sure your have 1 GB of RAM in order to run Expelled to its full potential.
Expelled will run on PC system with WIndows 7 and upwards. Additionally it has a Mac version.
