688(I) Hunter/Killer, the most realistic submarine simulation ever developed for PC. Master the sonar and weapons control systems, learn to develop real target situations and outfit your boat with the latest advanced weaponry. Then use your skills to complete the tour of duty and earn your dolphins to become a true submariner.
Over 12 detailed operating stations: Control all aspects of submarine warfare, including the sonar suite, fire control, helm and target motion analysis
Multiplayer Warfare: Seek and Destroy up to 8 players over the internet or LAN
Real-life situations: Conduct detailed training and single missions, plus a full campaign based on political analysis from real world situations
Full 3D Technology: Full 3D technology allows for multiple camera views and accurate 3D models of over 20 different naval weapons platforms
windows Minimum
OS: Windows 2000/XP/7
Processor: Pentium III
Memory: 256MB RAM
Graphics: 32MB video card (Nvidia Geforce or ATI Radeon)
Storage: 1.5G Hard drive space
To activate the game, you need a Steam Account
Login or register at the official Steam Website and download Steam client
Install and start application, login with your Account name and Password
Click the Games Menu.
Choose Activate a Product on Steam...
Follow the onscreen instructions to complete the process
After the successful code verification, go to the "MY GAMES" tab and start downloading.
News & Updates
2025-12-13
Test Your Gaming IQ with YUPLAY and Win
As the holiday season is already nearly here, we prepared a special Christmas Giveaway that would let you test your gaming IQ with YUPLAY and win some awesome prizes while doing it! Make sure to regularly check and follow our YUPLAY X profile in order to be in the know about any possible chances to participate and enter the Christmas Giveaway in a timely manner. Are you up to the challenge and ready to guess some great gaming titles?
Dive Into 2025’s Most Addictive Video Games – Part 2
As you probably know, we separated the most addictive video games blog into 2 dozens of Steam games in almost all of the main gaming genres, so there should be something for everyone to enjoy on it! Now we are here to continue our list and if you checked out the first part of it, you know we made sure to discuss some of the top hit games that recently got released. We assure you there will not be bad titles in the second part as well, so let’s head over to the first entry in part 2 immediately!