- For the Sega Master System game with the product code 9003, see SpellCaster.
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9003 Inc. was a Japanese video game developer and publisher. It merged with OPeNBooK to form OPeNBooK9003 in 1996.
9003's only contribution to the world of Sega before its merger was a release of Aquazone Desktop Life for the Sega Saturn.