The cheapest graphics card you can play it on is an NVIDIA GeForce 6100. You will need at least 300 MB of free disk space to install blocks. The minimum memory requirement for blocks is 600 MB of RAM installed in your computer. An Intel Pentium 4 2.00GHz CPU is required at a minimum to run blocks.
blocks will run on PC system with Windows 7/8/10 and upwards. Additionally it has Mac and Linux versions.