Fortified Zone (Game Boy - 1991)
Cover art (Source: signature found on the artwork)
Maru's Mission, AKA Oira Jajamaru! Sekai Daibōken / おいらじゃじゃ丸！世界大冒険 (Game Boy - 1990)
Alternate cover art for the US version (Source: signature found on the artwork)
Rampart (NES - 1992)
Cover art (Source: signature found on the artwork)
Totally Rad, AKA Magic John / マジック・ジョン (NES - 1990)
Cover art for the US version (Source: signature found on the artwork)
Fortified Zone
Maru's Mission
Rampart
Totally Rad