This site contains useful information about the DOTA 2 custom game Battleships, by radar. You can subscribe to this gamemode on the Steam Workshop Page.
How to play:
Co-Op Update - (2/24/2016)
I have added a co-op survival mode.
When all players going the south alliance they will activate this survival mode and fight waves on increasingly difficulty AI controlled hero ships that will use abilities and eventually overrun the players. The victory condition remains the same (destroy the enemy harbors or castle before your own are destroyed.
The mode is still in development so please provide feedback. if people really enjoy it there are pleanty of enhancments that could me made to ensure it has excellent replay value.
This update comes in light of viewing my statistics and seeing that most of battleships games have 2-4 players these days. Because 1v1 gameplay is not as engaging, I decided to add a co-op mode in hopes that games with just a few players could team up and have more fun than they would. As a secondary upside, if the co-op mode becomes even slightly popular, it should be easier to find larger games as well.
Trading Update! - (10/5/2015)
Trading is the major focus of this update.
In order to try trading, purchase a trade boat from the "Trading Ships" tab of the new ship shop.
Trade missions provide the trader with a large reward and each of their team mates with a small one.
Traders can not give gold directly to their teammates. However, whenever a trader completes a mission, their teammate will be given some gold. Traders can also freely give the consumable items purchased from the trade merchants to their teammates.
Trade boats can use weapons and utility items just as other ships do.
If a trader is killed while carrying cargo, that cargo can be stolen and turned into any trade post for a reward.
The amount of gold earned in trade missions scales with game time and mission difficulty.
Boats:
Three new trade boats added to the game: Phoenician Trader, Cargo Ship, and Ghost Trader. Each comes with new and unique abilities to expedite their trade missions and escape danger.
New Items:
There are 18 new items in the game which can be found distributed among the 9 new trade merchants located around the map. These items are all shareable and consumable but can only be purchased by the traders to assist their teams.
UI:
Hugely improved ship shop where you can explore the stats and abilities of the available ships before purchasing them.
New Trading UI with amazing original artwork by Taterfish (more art coming for last 2 shops)