PT-109 is a naval simulation video game developed by Digital Illusions and Spectrum HoloByte in 1987 for the Macintosh and MS-DOS.

Players also learn about the history of the ship, because some of the patrol boats were only available at specific stages during World War II.

The game has four levels of difficulty, and it also gives the player the ability to send radio messages to the base to request air or ship support, an automatic pilot feature, and assignment of patrols.

He recommended using the practice mode to become familiar with the game, instead of the lowest difficulty level, to maximize its lifetime.

[6] The Palm Beach Post in 1988 approved of the Macintosh version's improved graphics compared to Gato, but reported that campaign enemies did not correctly react to the player.