Castle of Dragon is a side-scrolling action game

Action game

Action game is a video game genre that emphasizes physical challenges, including hand–eye coordination and reaction-time. The genre includes diverse subgenres such as fighting games, shooter games, and platform games, which are widely considered the most important action games, though some...

 for the Nintendo Entertainment System

Nintendo Entertainment System

The Nintendo Entertainment System is an 8-bit video game console that was released by Nintendo in North America during 1985, in Europe during 1986 and Australia in 1987...

 in 1990. It is a port of an obscure arcade game

Arcade game

An arcade game is a coin-operated entertainment machine, usually installed in public businesses such as restaurants, bars, and amusement arcades. Most arcade games are video games, pinball machines, electro-mechanical games, redemption games, and merchandisers...

 of the same name, produced by Athena Co.

Athena (company)

is a Japanese video game developer, founded in July 1987.-Games:*Biometal *Blockids *Castle of Dragon *Championship Bowling *Daioh *De-Block...

; the gameplay and graphics were significantly modified to suit the abilities of the NES.

Story

The Dragon Master, Darklarza, has been terrorizing the kingdom for numerous years. The king was forced into exile by this threat. He retreated, with the bravest knight in the kingdom.

This knight, named Geraden, must hold his fort. Darklarza stages an attack on the king's fortress, breaks in and manages to abduct the royal princess. Now it is up to the brave Geraden to journey throughout the kingdom, rescue the captive princess, and put an end to Darklarza's evil reign once and for all.