4Stack #90 — answers & breakdown

Sunday, October 11, 2026

The sixteen cards in this puzzle were: Factorio, Satisfactory, Dyson Sphere Program, shapez, SpaceChem, TIS-100, Human Resource Machine, Opus Magnum, OpenTTD, Transport Fever, Railway Empire, Mini Metro, Belt, Blueprint, Throughput, Main bus.

The four stacks

Factory automation games

Factorio, Satisfactory, Dyson Sphere Program, shapez

Programming puzzle games

SpaceChem, TIS-100, Human Resource Machine, Opus Magnum

Transport & logistics sims

OpenTTD, Transport Fever, Railway Empire, Mini Metro

Automation jargon

Belt, Blueprint, Throughput, Main bus

Want to try it yourself? Play puzzle #90 — archive plays don't affect your streak. Or jump into today's puzzle.