Castelian, available in both European and US regions for the NES, is likely an action-adventure or role-playing game, judging from its title. Specific gameplay details are scarce. It’s possible it was similar in gameplay to other titles of that era that involved exploration, combat, and puzzle-solving.  The lack of easily accessible information about its developer and publisher requires deeper research. Its release in different regions suggests it might have enjoyed some measure of success or appeal.

Castelian (Europe)

Casino Derby (Japan)