Metal Gear Solid Ground Zeroes will see the base-building and development from PSP outing Peace Walker return - and it'll be a feature that will likely be accessible from smart phones and other devices.

"The concept of developing weapons at your base is a very cool idea, and something that could be popular. It's something we've been thinking of," Hideo Kojima said during a packed developer session at today's Eurogamer Expo.

"Furthermore, nowadays there are various ways to access the game world - you're not just playing in your living room on your games console," Kojima continued. "You may also access through your cell phone and other devices and still access that same game. I think in that respect that motherbase system lends itself very well to that system, and that's something we're planning on for Ground Zeroes."

The base will be accessible in-between the various open world sections that make up Metal Gear Solid Ground Zeroes. You'll be able to reach the base by the helicopter that featured in the initial reveal of Ground Zeroes, and once there you can explore the base on foot as it develops around you.

Ground Zeroes will also feature a full day/night cycle that leans on the Fox Engine's enhanced lighting abilities - and it'll be something that ties in to the stealth-based gameplay.

The extended demo was once again shown off, with Kojima emphasising that it's running off of a PC that boasts similar specs to an Xbox 360 and PlayStation 3.