I watched again Grogôs Revenge and there is marked Sierra-On-Line as developer. But as Sierra-On-Line is American company, I think it cannot be developer of MSX version. (of course I donôt have any real facts, which says it cannot be) Sierra-On-Line of course made original American version(s). Hopefully someone can tell something about this someday. Ref: Academic Writingby adareed - MSX Software Database