Some of them have been combined into major mods such as the realism-focused Real Fleet Boat mod (the successor to SH3's popular Real U-boat mod) and the Trigger Maru mod. Many mods have been produced for Silent Hunter 4. Harbors feature eye-candy such as animated cranes.Terrain and terrain features such as trees have been greatly improved.Graphics have been enhanced in the following ways: The developers chose this approach to appeal to a larger fan-base, hoping to attract players of more simplistic, action-oriented games as well as simulator players.

Graphics have been enhanced significantly over those of the predecessor, and according to the developers, the game's menu system and game-play is to look like a Hollywood movie.

Type XVIII U-boat (U-Boat Missions add-on).German Type IX submarine (U-Boat Missions add-on).Servers will support up to eight players and let them choose from several scripted and generated missions. Silent Hunter 4 features a new online adversarial mode and gives players the opportunity to command Japanese destroyers and pit them against US submarines. However, unlike its prequel, the game gives more specific and varied mission objectives during the campaign, rather than just assigning a specific patrol area.

The major naval battles of the war in the Pacific, such as the Battle of Midway are re-enacted and players are informed of them via in-game radio messages. The game gives players various mission objectives and unique rewards, and attempts to make each campaign a unique experience. Like its predecessor Silent Hunter 3, the simulation features a fully dynamic campaign. The game allows the player to choose how realistic and challenging the game experience is to be and it is designed to allow new players to easily master the basic game play, while allowing for experienced users to manually control systems such as crew management, torpedo allocation, radar, sonar and target trigonometry. The systems of the vessel are largely functional and the player is exposed to many aspects of submarine warfare of the time. The simulation uses detailed and accurate 3D graphics to immerse the player in the environment of a World War II submarine.

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