In terms of game file size, you will need at least 100 MB of free disk space available. Get'em Gary system requirements state that you will need at least 256 MB of RAM. An Intel Core i5-650 CPU is required at a minimum to run Get'em Gary. The cheapest graphics card you can play it on is an NVIDIA GeForce GT 525M.
Get'em Gary will run on PC system with Windows 7 64-bit and upwards.
