https://www.lemon64.com/games/details.php?ID=1283
https://www.gamesdatabase.org/game/commodore-64/impossible-mission
https://www.gamesdatabase.org/Media/SYSTEM/Commodore_64//Manual/formated/Impossible_Mission_-_1984_-_Epyx,_Inc..pdf
https://www.c64-wiki.com/wiki/Impossible_Mission