Ratatan Wiki - System Requirements
Minimum
OSWindows 10 64-bit
ProcessorDual-core 2.4 GHz
Memory8 GB
GraphicsNVIDIA GeForce GTX 950 / AMD Radeon R7 360 / Intel HD 630
Storage10 GB
Recommended
OSWindows 10 64-bit
ProcessorQuad-core 2.4 GHz
Memory16 GB
GraphicsNVIDIA GeForce RTX 2060 / AMD Radeon RX 5600 XT / Intel Arc A580
Storage10 GB
Source: Confirmed via multiple independent sources
Broadband internet with a non-symmetric NAT type is specifically required for online co-op. A separate third-party source listed an implausible CPU figure inconsistent with standard naming conventions and was disregarded in favor of these more detailed, consistent figures.