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ISCO (イスコ), short for "Intelligent System Corporation" was a video game developer company, with many of its games subcontracted down to other developers.^[1]

• ピザストーリー (year unknown; genre ETC)

• Midnight Resistance (for Data East; subcontracted to Opera House; 1990)
• Verytex (for Asmik; subcontracted to Opera House; 1991)
• Two Crude Dudes (for Data East; subcontracted to Opera House; 1991)
• Master of Monsters (for Toshiba EMI; subcontracted to Opera House; 1991)
• Captain America and the Avengers (for Data East; subcontracted to Opera House; 1992)

• Side Pocket (for Data East; subcontracted to Opera House; 1994)

• マイ・ベスト・フレンズ (My Best Friends: St. Andrew Jogakuin Hen (for Atlus; 1996)?)
• Game-Ware 3 Gou (ピピットボーイの大冒険３) (for General Entertainment; 1996)
• AI Igo (for ASCII Something Good; 1997)
• Game-Ware 4 Gou (窓拭き職人ゴンドラ君) (for General Entertainment; 1997)
• GW４（ピピットボーイの大冒険４） (page says Game-Ware 4 Gou, picture shows Game-Ware 5 Gou)
• Deep Fear ("ムービー" (video production?) and PAL conversion) (for Sega; 1998)

• Drop Off (for Data East; subcontracted to Cream; 1990)

• 映画監督物語 (simulation game) (KSS?)
• お父さんのための競馬２ (simulation game)
• お父さんのための競馬 (simulation game)