The cheapest graphics card you can play it on is an NVIDIA GeForce 7100 / nForce 630i. But, according to the developers the recommended graphics card is an NVIDIA GeForce GTX 1050. Underflow system requirements state that you will need at least 2 GB of RAM. Additionally, the game developers recommend somewhere around 8 GB of RAM in your system. An Intel Pentium 4 2.00GHz CPU is required at a minimum to run Underflow. Whereas, an Intel Core i7-7700 is recommended in order to run it. In terms of game file size, you will need at least 3 GB of free disk space available.
Underflow will run on PC system with Windows 7 and upwards.