Official specs from Steam

Sackboy: A Big Adventure system requirements

Minimum and recommended PC specs as listed by the developer on Steam.

Minimum

NoteRequires a 64-bit processor and operating system
OSWindows 10 64-bit (version 1809)
ProcessorIntel Core i5-6400 @ 2.7GHz, AMD FX-6300 @ 3.5GHz
Memory8 GB RAM
GraphicsNVIDIA GeForce GTX 660, AMD Radeon R7 265
Storage60 GB available space
Additional Notes60 GB HDD (SSD Recommended)

Recommended

NoteRequires a 64-bit processor and operating system
OSWindows 10 64-bit (version 1809)
ProcessorIntel Core i7-4770K @ 3.5GHz AMD Ryzen 5 1500X @ 3.5GHz
Memory12 GB RAM
GraphicsNVIDIA GeForce GTX 1060, AMD Radeon RX580
Storage60 GB available space
Additional Notes60 GB HDD (SSD Recommended)

FAQ

What graphics card do I need for Sackboy: A Big Adventure?

Minimum: NVIDIA GeForce GTX 660, AMD Radeon R7 265. Recommended: NVIDIA GeForce GTX 1060, AMD Radeon RX580.

How much RAM does Sackboy: A Big Adventure need?

Sackboy: A Big Adventure needs 8 GB RAM at minimum, 12 GB RAM recommended.

How big is Sackboy: A Big Adventure?

Sackboy: A Big Adventure requires 60 GB available space.

Does Sackboy: A Big Adventure run on Mac or Steam Deck/Linux?

There is no native macOS version. There is no native Linux build (Proton compatibility may vary).