《大海戰》（日文原名：ネイビーブルー）是由 I'Max 於 1992 年 2 月在任天堂 Famicom（紅白機）上推出的一款策略模擬遊戲，其核心玩法以經典紙筆遊戲「海戰棋」（Battleship）為基礎。在紅白機生命週期的末期推出，將傳統益智遊戲升華為電子策略對抗，增添豐富的戰術選擇與視覺呈現，成為腦力博弈愛好者心目中的佳作。

在技術上極大地提升傳統海戰棋的趣味性。畫面分為「搜索雷達面」與「戰鬥演出面」，當玩家選定座標發射砲彈時，螢幕會切換到精美的近景畫面，呈現艦船爆炸與水花濺起的效果，帶來強烈的代入感。音樂則充滿海軍風格的莊嚴與肅殺感，當我方艦隊被敵方發現時，旋律會急促加速，強化危機氛圍。除了紅白機版本，在 Game Boy 上也受到玩家歡迎，隨時隨地皆可進行海戰對決。

劇情雖簡單，但充滿策略性。故事描述兩支強大的海軍艦隊在太平洋廣闊海域對峙，玩家扮演艦隊指揮官，必須在敵方無法察覺的情況下布置自己的船隻。遊戲目標是透過雷達偵測與邏輯推理，先將敵方的航空母艦、戰列艦、巡洋艦、驅逐艦與潛水艇全部擊沉，同時避免自己的艦隊被全滅。

在操作上，將傳統規則延伸出多種戰術選擇。在網格地圖上自由布置艦隊，運用心理預判讓敵人難以猜測艦船位置。遊戲中的特殊道具系統更增添變化，包括雷達掃描可探測周圍 3x3 區域，十字轟炸可一次攻擊橫向與縱向目標，魚雷可針對隱蔽潛艇進行打擊，維修系統則能延長受損艦船的生存時間。此外，Password 系統可以保存當前戰況，方便玩家續玩。

在市場上獲得高度評價，評論家稱讚其兼具耐玩性與策略深度。在擊中敵艦後推測艦船方向的過程充滿腦力挑戰，而雙人對戰更帶來緊張刺激的心理博弈，其樂趣與《諜對諜》系列有得一比。歷史上，《大海戰》被認為是紅白機上最成熟的海戰棋改編作品之一，證明即便沒有華麗的即時動作，僅憑座標與策略也能營造出逼真的戰場氣氛。

最經典的遊戲回憶莫過於 「當場上只剩下一艘小小潛水艇時，憑著運氣與心理戰術連續躲過敵方三次轟炸，最終用最後一發反擊擊沉敵方航空母艦，完成絕地大翻盤」。這種緊張刺激與腦力博弈的快感，使人至今仍難以忘懷。

Navy Blue (Japanese title: ネイビーブルー) is a strategy simulation game developed by I'Max and released for the Nintendo Famicom in February 1992. Its core gameplay is based on the classic pen-and-paper game Battleship. Released toward the end of the Famicom’s lifecycle, the game elevated the traditional puzzle game to an electronic strategic experience, adding tactical depth and visual flair, making it a favorite among fans of cerebral gameplay.

Technically, Navy Blue greatly enhanced the traditional Battleship formula. The screen is divided into a "radar view" and a "battle view." When a player selects coordinates to fire upon, the game switches to a detailed close-up, showing ships exploding or water splashing, creating a strong sense of immersion. The music complements this, with a naval-themed, solemn, and tense tone; when your fleet is detected, the tempo accelerates, heightening the feeling of danger. Beyond the Famicom version, the game was also popular on the Game Boy, allowing players to engage in naval battles on the go.

The game’s story is simple but strategic. It depicts two powerful naval fleets clashing across the vast Pacific Ocean. Players take command of one fleet and must position their ships without being detected by the enemy. The ultimate objective is to use radar scanning and logical deduction to sink the enemy’s aircraft carriers, battleships, cruisers, destroyers, and submarines before one’s own fleet is destroyed.

Gameplay mechanics introduce several strategic layers beyond the classic rules. Players can freely arrange their ships on a grid map, employing psychological tactics to confuse the opponent. Special tools and weapons further enrich strategy: radar scanning can reveal a 3x3 area of enemy ships, crossfire bombing attacks both horizontal and vertical lines, torpedoes target hidden submarines, and a repair system can extend the lifespan of damaged ships. The game also features a password system to save progress and continue play.

Navy Blue received high praise for balancing accessibility with deep strategic gameplay. Critics highlighted the enjoyment of deducing the direction of enemy ships after a hit and emphasized the excitement of two-player matches, which brought tense, competitive psychological battles comparable to the Spy vs. Spy series. Historically, it is considered one of the most polished Battleship adaptations on the Famicom, proving that even without flashy real-time action, strategy and probability alone can create a realistic and thrilling battlefield experience.

The most memorable moments often come from tense comebacks: “With only a tiny submarine left on the board, dodging three enemy strikes through luck and psychological strategy, then sinking the enemy aircraft carrier with a final counterattack for a dramatic turnaround.” Such moments of strategy, tension, and clever play continue to resonate with fans to this day.