《越戰1975》（NAM-1975 / ナム1975）是由日本知名遊戲廠商 SNK 於 1990 年推出的越戰題材準 3D 縱深射擊遊戲（又稱「烏卡拉式」射擊遊戲）。作為 SNK 傳奇基板 MVS（Neo Geo）歷史上的「001 號作品」（即首發護航遊戲第一號），本作在遊戲史上具有極其特殊的開創性地位。它以嚴肅、沉重的反戰文學色彩為基調，憑藉著獨特的後視點射擊玩法、硬核的「翻滾無敵迴避」機制以及極具震撼力的電影級過場動畫，在 90 年代初的街機廳裡轟托出了一場硝煙彌漫的鐵血傳奇。

遊戲的故事背景設定在 1975 年越南戰爭即將進入尾聲的最後幾個月。玩家扮演美軍特種部隊「特種作戰群」的精銳戰士 Silver（雙人聯機時二號機為 Brown）。他們接到了一項最高機密的特殊任務：深入戰火肆虐的越南叢林與淪陷城市，去營救一位被瘋狂叛軍綁架的前美軍天才科學家「R. Muckly 博士」及其女兒。然而隨著任務的深入，主角們絕望地發現，這場戰爭的背後隱藏著一個企圖用生化武器與巨型導彈毀滅世界的驚天陰謀。面對狂熱的敵軍、戰友的犧牲以及永無止境的砲火，兩位戰士必須在泥濘與血海中殺出一條血路。

在核心玩法與系統上，本作採用了在當時極具創新的「準 3D 後視點固定縱深射擊」模式（類似於卡普空的《荒野大鏢客》或《突擊奇兵》）。玩家的角色位於螢幕下方，視角由後向前延伸。手把控制呈現出一種精妙的「雙重聯動」：當玩家單純移動搖桿時，控制的是主角在螢幕下方的左右奔跑；而當玩家按住射擊鍵時，搖桿則會切換為控制螢幕中前方的「準星」來瞄準敵人。

為了應對敵方全方位、無死角的瘋狂彈幕與手榴彈轟炸，遊戲引入了核心的「高速翻滾無敵（Roll）」機制。玩家只要在推動搖桿的同時按下跳躍鍵，角色就會向左或向右使出極其流暢的戰術翻滾。在翻滾期間，角色擁有短暫但極其關鍵的全身無敵判定，這是高難度下保命、強行穿越密集彈幕的唯一手段。此外，戰場上還會隨機掉落多種特殊武器，如威力巨大的「手榴彈」、噴射火柱的「火焰噴射器」以及撕裂一切的「加特林機槍」，甚至還能解救出一位手持雙槍、會自動幫玩家射擊雜兵的女俘虜「Sally」，大幅提升了戰場的火力和推進爽快感。

得益於 Neo Geo 基板在 1990 年堪稱怪獸級的硬體規格，本作的視覺與聽覺表現展現出了降維打擊般的強大實力。遊戲大膽採用了大量極具電影感、帶有粗獷線條與陰暗色調的「真人比例過場動畫（Cutscenes）」，並配有高質量的全語音英文旁白與角色對話。那低沉、滄桑的畫外音在關卡間緩緩訴說著戰爭的殘酷與人性的瘋狂，將那種 70 年代越戰電影（如《現代啟示錄》）的蒼涼與沉重感渲染得淋漓盡致。

畫面上，無論是直升機轟鳴著掠過被烈火焚燒的村莊、水面泛起逼真漣漪的湄公河沼澤，還是最終 Boss 那座矗立在夜空下、正準備發射洲際導彈的巨型要塞，都展現出了 90 年代初最頂尖的像素雕琢工藝。再配合上充斥著直升機螺旋槳轟鳴、連環爆炸聲以及悲壯重金屬軍樂的背景音效，《越戰1975》成功在街機螢幕上打造了一場無比真實、令人窒息的「虛擬戰地體驗」，成為 Neo Geo 帝國開山第一作中最為硬派、無可替代的射擊里程碑。

NAM-1975 (ナム1975) is a seminal pseudo-3D third-person gallery shooter developed and released by SNK in 1990. Standing as the legendary "Launch Title No. 001" for SNK’s revolutionary MVS (Neo Geo) arcade architecture, this masterpiece occupies a historic, foundational position in gaming lineage. Eschewing the lighthearted action tropes of its era, the game adopted a mature, gritty anti-war cinematic tone. Powered by its signature rear-view perspective, a hardcore "invincibility combat roll" mechanic, and groundbreaking cinematic cutscenes, it unleashed a raw, smoke-filled, and unforgiving theater of war across arcade floors in the early 1990s.

The narrative unravels during the chaotic, closing months of the Vietnam War in 1975. Players step into the combat boots of Silver (and Brown for Player 2), elite commandos from the U.S. Special Operations Group. They are deployed on a top-secret extraction directive: infiltrate war-torn jungles and hostile urban centers to rescue Dr. R. Muckly, a brilliant former American military scientist, and his daughter, who have been abducted by a rogue, radical faction. As the operations deepen, the commandos unearth a apocalyptic conspiracy: the rogue army intends to use stolen bio-chemical tech and ballistic missiles to trigger global devastation. Surrounded by fanatical forces, falling comrades, and ceaseless artillery, the soldiers must carve a path to the core through mud and blood.

Mechanically, the game utilizes a sophisticated "pseudo-3D cabal-style" shooting system. The player characters occupy the foreground of the screen, moving strictly along a horizontal axis, while looking forward into the depth of the battlefield. The joystick control features an ingenious dual-layer functionality: moving the stick normally dictates the character's physical running trajectory to dodge incoming fire. However, the moment the player holds down the fire button, the joystick dynamically locks the character's movement and shifts control to a crosshair reticle on the horizon to target entrenched enemies, snipers, and armor.

To survive the absolute bullet-hell landscape of mortar fire, RPGs, and incoming grenades, NAM-1975 weaponized a mandatory "Tactical Evaporative Roll." Pressing the jump button while pushing the joystick laterally forces the commando into a lightning-fast combat dive. During this animation, the character possesses a brief but vital window of absolute invincibility frames—the primary tool for weaving through impenetrable walls of lead. The combat loop is supplemented by high-tier ordnance drops, including specialized Grenades, heavy Flamethrowers, and devastating Gatling Guns. Players can even liberate a captive female guerilla fighter named Sally, who acts as an automated, dual-wielding sidekick to maximize suppressive fire.

Leveraging the gargantuan processing and memory specifications of the brand-new Neo Geo hardware in 1990, the game's audiovisual delivery was revolutionary. SNK integrated striking, starkly stylized pixel cutscenes between operations, accompanied by high-fidelity, fully voiced English narration. The gravelly, somber voiceover masterfully captured the psychological exhaustion and bleakness reminiscent of iconic 70s cinema like Apocalypse Now.

Visually, the atmospheric detail is impeccable: military choppers roar past burning thatched-roof outposts, murky Mekong deltas ripple with realistic physics, and the final stage unveils a colossal, night-shrouded launch fortress bristling with anti-air turrets. Coupled with a tragic, driving military-synth rock soundtrack and the constant crunch of digitized explosions, NAM-1975 delivered an immersive, breathtaking combat simulation that perfectly demonstrated the sheer dominance of the Neo Geo platform at its genesis.