"Nintendo provided a big update on Steel Diver today, with screenshots and new gameplay details. Of particular note is first info on multiplayer.
Multiplayer mode, or "Naval Battle Mode," is set up like a turn-based gridded strategy game, only you're unable to see your opponent's ships at the start. You can play this mode using download play, meaning you'll just need one game card for two players.
You and your opponent have a set of submarines, freighter ships and escort ships. The submarines are the only ships that can enter enemy territory. The escort ships can attack enemy subs who've crossed over. The freighters can't engage in combat. If your freighters all sink, you lose the battle.
You start off this mode by first moving your subs into enemy territory, guessing where they might be located. As you approach, the map will be marked in pink and yellow indicating areas that might have enemy ships. You'll be able to use sonar to get a more precise idea of enemy position, but your position will also be revealed.
Once you've determined precise enemy position, you'll switch to periscope mode to attack. If you end up being spotted, your submarine will come under attack by the enemy escort ships."
See the entire article: http://www.andriasang.com/e/blog/2011/02/25/steel_diver_multiplayer/
Official site: http://www.nintendo.co.jp/3ds/asdj/index.html
