In terms of game file size, you will need at least 1 GB of free disk space available. The cheapest graphics card you can play it on is an NVIDIA GeForce 6100. But, according to the developers the recommended graphics card is an NVIDIA GeForce GTX 750. An Intel Celeron CPU is required at a minimum to run Planet 1138. However, the developers recommend a CPU greater or equal to an Intel Core i3-530 to play the game. Planet 1138 system requirements state that you will need at least 1 GB of RAM.
Planet 1138 will run on PC system with Windows 7 and upwards.