Jaleco Entertainment
Titles,
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JJK Research Limited
JJK Research Limited later became Thunderteam and is currently owned by ThunderWare Research Center.
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Johnson Scanatron
The company behind the football (soccer) management simulation The Double.
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John Henry Enterprises
The company behind Deadly Mission.
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Jor-And
The company behind Secret Agent for PC and Apple II.
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JoWood
Fishtank Interactive,
Titles,
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Joymax
Joymax Co. LTD. is a Korean based developer whose primary product is the free forever MMORPG Silkroad Online.
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Jsj Soft Ltd
The company behind the Medialan series.
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JV Games
Developer of the Towers series for the GameBoy.
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