GoKawiilReverse-engineering Factorio's quality RNG reveals it's fully deterministic
A player analyzed Factorio's Space-Age DLC quality system, which uses a pseudo-random number generator rather than true randomness to determine item and building quality upgrades. The write-up documents an in-game implementation that exploited this predictable RNG, though it notes the technique breaks under Factorio version 2.1 due to changes in how the RNG is invoked, while the underlying algorithm remains the same.