https://www.mobygames.com/game/samurai-warrior-the-battles-of-usagi-yojimbo
http://www.hardcoregaming101.net/samurai-warrior-the-battles-of-usagi-yojimbo-commodore-64-amstrad-cpc-zx-spectrum-1988samurai-warrior-remakes/
https://en.wikipedia.org/wiki/Samurai_Warrior:_The_Battles_of_Usagi_Yojimbo#cite_note-retrogamer.net-1