Softdisk Publishing released Dangerous Dave in the deserted pirate's hideout in the year 1990. It's a very good action game, part of the Dangerous Dave series. Dangerous Dave in the deserted pirate's hideout is protected, runs on DOS and can be played by 1 player.
status: protected (protected by its owner, usually a commercial game)
The idea of Dangerous Dave came to John Romero under the influence of Super Mario. There are definitely similarities that are easily noticeable, such as the secret levels, the level design, the monsters, and the jumping.