The game that predates real-time strategy. One flying unit, base capture, and unit production on the Mega Drive.
Herzog Zwei was developed by Technosoft and released for Mega Drive in December 1989 — a game widely cited as the forerunner of the real-time strategy genre. Players controlled one flying mech unit directly while simultaneously issuing orders to ground troops, capturing bases across a map, and spending resources on new unit production. The strategic layer — base control, supply routes, unit compositions — operated in real-time while the player also fought in direct combat. Herzog Zwei was released in North America in 1990 and influenced the designers of Dune II and Command & Conquer, which they have acknowledged. It is considered one of the most historically significant Mega Drive titles for its genre influence.
About this game
Herzog Zwei (1989) is one of the earliest real-time strategy games in history — and the first to run on a home console. Players control a transforming fighter jet/mech that can carry and deploy infantry units across a battlefield, capturing bases and destroying the enemy's home base. Predating Dune II (1992), which is commonly cited as the genre's origin, Herzog Zwei established core RTS concepts that would define the genre for decades.
Key Features
A transforming mech/jet that can carry one infantry unit at a time and deploy them to capture neutral bases. Resource management through base capture — more bases means faster money generation for reinforcements. A selection of infantry unit types with different combat roles (tanks, anti-air, infantry). Two-player simultaneous split-screen vs mode for head-to-head competition. Real-time battles with no pause — all decisions made while the action continues. 16 stages of escalating campaign plus a two-player versus mode.
The Story Behind
When Herzog Zwei appeared in December 1989, the concept of a 'real-time strategy' game did not yet exist by that name. Technosoft's game asked players to manage units, control resources, and execute tactical movements all at the same time without pausing — ideas that Westwood Studios' Dune II (1992) would formalize and the Command and Conquer / StarCraft lineage would popularize globally. Herzog Zwei predated all of them on a home console. The sequel to the 1988 PC game Herzog, it took those concepts and made them playable with a gamepad — a technical and design achievement for its era.
Tricks & Tales
Herzog Zwei is widely cited by game designers and academics as a precursor to the real-time strategy genre, predating Dune II by over two years. Its influence is acknowledged by designers of later RTS titles. The name 'Herzog Zwei' is German for 'Duke Two' — a reference to the original Herzog ('Duke'), a 1988 PC game by Technosoft that established the transformer-mech concept. The North American version was published by Sega rather than Technosoft, as was common for Mega Drive third-party titles exported to the West.
Collector's Guide
Region & Compatibility
The Japanese Mega Drive and the North American Genesis use different cartridge shapes — Japanese carts have a notch on the side that fits a locking arm inside the JP console, while Genesis carts are slightly narrower with a different profile. The two cartridges are physically incompatible without an adapter. European PAL carts share the same shape as the Genesis. Beyond physical shape, some games from 1992 onward also check a software region register and will lock out foreign consoles even with an adapter. A region converter cartridge or a mod chip addresses both the physical and software locks.
Maintenance Tips
The cartridge edge connector — both on the console and the cartridge itself — is the most common source of read errors on a Mega Drive. Clean the cartridge contacts with a cotton swab lightly dampened with 90% or higher isopropyl alcohol, and let them dry completely before inserting. Avoid blowing into the slot; moisture accelerates pin corrosion. For persistent problems, the console's cartridge slot pins can be gently cleaned the same way using a thin swab.
What to Watch Out For
Before buying, these are the points worth knowing — from someone who handles original Japanese Herzog Zwei copies regularly.
Will a Japanese Mega Drive cartridge work on a North American Sega Genesis or European Mega Drive?
Not directly. Japanese Mega Drive and North American Genesis cartridges have different physical notch positions, preventing direct insertion without a pin adapter. The console also enforces regional settings in hardware — a Japanese cartridge on a Western console will often lock up or refuse to boot without modification. Playing Japanese Mega Drive software is most reliably done on a Japanese Mega Drive. Region adapters and mod chips exist for those wishing to run imports on Western hardware.
How should I clean a Mega Drive cartridge?
Apply 90% or higher isopropyl alcohol to a cotton swab and wipe the gold-plated edge contacts on the base of the cartridge. Most Mega Drive cartridges use standard Phillips screws if the shell needs opening for deeper cleaning. Clean the console's slot separately — oxidized slot contacts are a common cause of boot failure on Mega Drive hardware.
Before You Buy
Things worth knowing before you buy Herzog Zwei
A short checklist for buying a used Mega Drive cartridge wisely — useful with any seller, anywhere.
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Choose a seller who tests it before shipping
A copy that has actually been powered on and checked is a known quantity. An untested one is a gamble you only settle after it arrives.
Look for a seller who states it was function-tested and says what they confirmed. A serious seller can tell you exactly what was checked.
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Make sure it fits your console
This is a Japanese Mega Drive cartridge; it differs in shape and region from the North American Genesis and may need a matching console or adapter.
Play it on a matching Japanese console or a region-free system, and confirm the listing states the region.
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If this title saves your progress, check the battery
Cartridges that save use a small coin-cell battery that fades over decades — a dead one wipes your save without warning.
Ask the seller whether the save function was tested. Replacing the battery is possible, but doing so erases any existing save.
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Check that the contacts are clean
Dirty edge contacts are the most common cause of startup and sound trouble in cartridges of this age.
Choose a seller who cleans the contacts before shipping. A note that it was tested and cleaned means the basics were handled.
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Read the seller's reviews and return policy
A 100% positive record across thousands of sales is close to a guarantee — packing, communication and problem-solving all work for everyone. A return policy protects you if something is off.
Read the feedback and confirm a clear return window before you buy.
The last step before buying anywhere is knowing what it's worth.
See what it's selling for on eBay →Unexpected Discoveries
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