Silkworm is a classic side scrolling shooter, developed by Tecmo and first released for arcade in 1988. In 1989 it was ported to the Amiga, Atari ST, Commodore 64, ZX Spectrum, Amstrad CPC and NES (1990) systems by The Sales Curve and released by Virgin Mastertronic.
Silkworm also spawned a sort-of sequel - SWIV. While SWIV was not a direct sequel, it followed the same core gameplay design of a helicopter/jeep team, albeit as a vertically-scrolling shooter instead of a horizontally-scrolling one. SWIV was described in the game's manual to mean both "Special Weapons Intercept Vehicles" and "Silkworm IV".
Silkworm was released at a time where side-scrolling shooting games were among the most popular genres - it was released at the same time as Forgotten Worlds, Sanxion, Mr. Heli and DNA Warrior.
The Spectrum version took 3 months to program from start to finish, and was a copy of the Amiga version, which was almost arcade perfect.
The game reached number three in the UK Spectrum sales charts, behind Robocop and Dragon Ninja.[
In November 1990, Virgin would rerelease Silkworm as part of the Edition 1 compilation, which also included Double Dragon, and the shoot'em ups Gemini Wing, and Xenon.
Silkworm had interesting graphics and relatively fast-paced gameplay. The player can take control of a Jeep mounted with a machine gun or a Helicopter mounted with forward and downward firing guns. Two players can work simultaneously and cooperatively against enemies, with one playing as the Jeep and one as the Helicopter.
In single-player mode, it is generally easier to play with the Helicopter than with the Jeep, but it can be more fun to play as the Jeep. As the Jeep, the player needs to destroy everything directly in front of it or be prepared to jump in order to avoid collisions. In two-player mode, the Helicopter and Jeep must cooperate, and the players depend on each other to succeed. For example, the Helicopter can only fire forward, so occasionally, the Jeep must cover the rear with his swiveling gun. However, when covering the rear, the Jeep is vulnerable from the front, so the Helicopter must cover him.
Silkworm featured a fairly wide variety of enemies, some of which had specific weaknesses, such as the armoured AA guns that could only be harmed when their shields were down to fire. Most famously, there was the "Goose" helicopter - a giant, heavily-armoured "mini-boss" helicopter that was composed of several smaller vehicles that connected together.
The players collect shields (which could alternatively be shot by the player in order to destroy all enemies on the screen), power cells which increase firepower and an additional bonus can be added to the score achieved. The game gets harder on the completion of each level. The game employed some destructible environmental elements, such as buildings and ancient ruins.
The speed was one of the defining parts of the gameplay, which the programmers who worked on the home conversions were keen to preserve, using a variety of programming techniques. One element that required work was the control system (the arcade original had three buttons, whereas most home systems had just one), but this was solved without much problem.
Silkworm featured a background music theme composed by Barry Leitch, which went on to be a minor cult hit, being included on a Sinclair User covermounted cassette, along with such classics as Shinobi and Continental Circus
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