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SPI SYSTEM GUIDES
The design systems that shaped an entire industry.
SPI treated wargame design as an engineering discipline — systems were named, versioned, and iterated across titles. These are the design frameworks that define the SPI legacy and still power reprints from Decision Games, GMT, and Compass today.
Core Systems
PRESTAGS System
#1Prehistoric Tactical Games System — five interlocking games covering ancient and classical warfare on a shared engine.
Napoleon's Last Battles System
#2Regimental Napoleonic combat with morale, cavalry charges, and formation effects — the Quadrigame system template.
Terrible Swift Sword System
#3Regimental-level ACW gaming with formation changes, command range, and morale checks — the gold standard for the era.
Sniper! / Patrol System
#4Man-to-man skirmish with morale, fatigue, and detailed weapon effects — one of the earliest true skirmish systems.
Air War / Fighting Wings-adjacent System
#5Detailed modern jet combat modeling energy management, missile envelopes, and pilot skill.
Monster Game System (War in Europe / War in the East)
#6Grand-strategic operational rules with production, replacements, and multi-front campaign turns.
DragonQuest RPG System
#7Percentile-based fantasy RPG with skill ranks, magic colleges, and detailed combat — SPI's answer to D&D.
Strategy & Tactics Magazine System (Design-for-Cause)
#8The editorial and design pipeline that let SPI ship a fully playtested new game every issue for a decade.