20,000 Leagues under the Sea

Coktel Vision, 1988

Based on the classic Jules Verne's novel of the same name, 20,000 Leagues takes you aboard the famous ship Abraham Lincoln for an adventure on (or should I say, "below") the high seas. Seek out the secret of the legendary leviathan as you attempt to solve puzzles that almost boggle the mind. Explore and discover the unseen underwater world aboard the Nautilus, the submarine navigated by Captain Nemo, while following the trail of the sea monster.

The enhanced graphics are quite good for the era. While the interface is a bit clumsy, the internal PC speaker supported sound is slightly better.

Mystery of the Mummy

Time Warp, 1991

Originally released for the Amiga Gaming System, this PC adaptation of Mystery of the Mummy casts you as the investigator of a missing mummy in Hamburg, Germany.  You have just five days to gather evidence, follow up leads and question witnesses in order to solve the crime. You can use items and interact with environments as you seek the perpetrator, but the fun is slightly marred by a few annoying action sequences and a cumbersome interface.  Lovers of detective games are urged to overlook these flaws, as the marvelous mystery elements make this one well worth playing.

KGB

Cryo Interactive Entertainment, 1992

From the creators of the game Dune comes this unusual adventure that casts you in the role of Maksim Rukov, a KGB agent. You have been assigned to investigate a series of murders in the Russian underworld, but to do so you must infiltrate a ring of cocaine smugglers. During your investigations you also uncovers a nefarious intrigue plotted by some high ranked KGB officials to oust President Gorbachev.

The game was released in the USA under the title, Conspiracy on an enhanced CD-Rom. The graphics in KGB are as impressive as they are in the game version of Dune and the sound is equally as good. Be sure to grab this one if you like secret agent adventures!