﻿Contra UnderWater | Six Characters. Back into Action.

FC / NES fan mod
In-game version: v20260925.002 | Guide updated: September 25, 2026
ROM filename: Contra UnderWater.nes

Classic run-and-gun action with six characters, two-weapon switching and two selectable campaigns: Classic Eight Stages and Underwater Eight Stages. Play solo or in two-player co-op.

Update highlights

Enhanced some character abilities, eased selected scenes, strengthened several underpowered bosses, and fixed a missing white-fabric sprite detail. Sheena’s base-stage crouching pose now has clearer skirt pleats and refined leg proportions.

Characters and weapons

• Bill and Lance: double jump; S automatically has the normal R effect.
• RD008 and RC011: brief airborne hover; M automatically has the normal R effect.
• Werewolf: high jump; L automatically has the normal R effect.
• Sheena: up to three eight-direction air dashes before landing, with stomp damage in every direction; F automatically has the normal R effect.

The built-in R effect applies only to each character's matching weapon. R pickups still work normally.
Carry two weapons and switch with SELECT. F fires paired fireballs along crossing waves without trails; L has a thicker beam.

Controls

D-pad: move / aim. A: jump. B: fire. SELECT: switch weapons. START: pause.
In side-scrolling stages, jump height varies with how long A is held. On the ground, input down → forward → A to slide. Other characters retain down + A for an airborne stomp and diagonal down + A for a kick.
For Sheena, press a direction + A again in midair to dash. Release and press A for each new dash; consecutive dashes cannot use the same direction. Press the opposite direction without A to cancel into a fall. Dashing is disabled near the ground.

Co-op and continues

• Touch the same pickup simultaneously and both players receive its effect.
• Continues default to 255. After GAME OVER, press START to choose a character, then resume at the death position in the current scene; SELECT ends the game instead. Offscreen or scrolled-away death positions use a safe respawn point.
• Choose a character again after ordinary stage-clear dialogue, retaining lives, weapons and continues. Campaign finales still lead to the ending.

Underwater challenges

These boss changes apply only to the Underwater campaign, not Classic Eight Stages.
• Stage 5: two snow bosses, 239 HP each, with fast movement, teleporting and dangerous body contact.
• Stage 6: three 239-HP giants. After the first falls, another drops on the right; at 100 HP or less, it is joined by a third on the left. Watch for the low-jump charge.
• Stage 7: defeat two snow bosses, then the three-giant sequence, then the original core. Core and lower cannons have 239 HP each; cannon volleys are doubled, and surviving cannons remain active during the boss waves.
• Stage 8: the final heart has three 239-HP phases: aimed bursts, a continuous sweeping laser to crouch beneath, and ground shockwaves to jump over.
• Stage 2 and 4 electric barriers shock the player before death.

Presentation and options

Six-character title artwork, selection portraits, a team opening, a group picture and character radio scenes. Stage-clear portrait colors have been corrected. Underwater music remixes the original themes; Classic campaign music stays unchanged.
Six languages are available, including localized GAME OVER messages. Starting stage, lives, continues, starting weapon and optional invincibility can be configured.

Playing

Open Contra UnderWater.nes in Mesen. After updating, start the ROM fresh; do not load emulator savestates from older builds.

Credits

Fan mod by 白河愁 / KRYSO. An unofficial fan project; the original game and related assets belong to their respective rights holders.
Thanks to 老猫 and 灼眼の双児 for testing.
Special thanks to 玩主小小虫 and 82 年电玩大叔 (in no particular order).
Some data used in this project comes from Contra - Heart of Galuga v1.3 [NES], a ROM hack by DimelNEX. Special thanks to DimelNEX.
Creator's website: http://www.ff18.com
QQ group: 1093320006

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魂斗罗：水下八关｜六名角色，再次出击

FC／NES 爱好者改版
游戏内版本：v20260925.002｜说明更新：2026-09-25
ROM 文件名：Contra UnderWater.nes

保留经典跑跳射击，加入六名角色与双武器切换。「经典八关」和「水下八关」均可直接选择，支持单人挑战、双人合作。

本次更新

增强部分角色能力，降低部分场景难度，强化部分偏弱的 Boss，并修复某个白色布料贴图不显示的问题。调整希娜基地关趴下动作，让裙褶更清楚、腿部比例更自然。

角色与武器

• 比尔、兰斯：二段跳，使用 S 弹默认带有原本的 R 效果。
• RD008、RC011：短暂空中悬停，使用 M 弹默认带有原本的 R 效果。
• 狼人：高跳，使用 L 弹默认带有原本的 R 效果。
• 希娜：落地前最多三次八方向空中突进，各方向都有踩踏攻击；使用 F 弹默认带有原本的 R 效果。

角色自带的 R 效果只作用于对应武器，拾取 R 道具仍正常生效。
随身携带两把武器，按 SELECT 切换。F 弹为两颗沿交叉波浪线前进、不留尾迹的火球；L 弹采用加粗激光。

基本操作

方向键移动／瞄准，A 跳跃，B 射击，SELECT 切换武器，START 暂停。
横版关卡中，按住 A 的时间控制跳跃高低；地面依次输入下 → 前 → A 滑铲。其他角色保留空中下＋A 踩踏、斜下＋A 飞踢。
希娜在空中再次按方向＋A 突进，每次需要松开再按 A，不能连续使用同一方向。不按 A、只按反方向可取消突进并下落；接近地面时不能发动。

合作与接关

• 两人同时碰到同一道具，都能获得效果。
• 默认接关 255 次。全灭后按 START，先选人，再回到当前场景的死亡位置；按 SELECT 则结束游戏。掉出屏幕或死亡位置已被镜头移走时，使用安全复活点。
• 普通过关对话后可以重新选人，保留生命、武器和接关次数；战役最终关仍进入结局。

水下挑战

以下 Boss 强化只作用于水下八关，不改变经典八关。
• 第五关：两只雪山 Boss，每只 239 点血，具备高速移动、瞬移与身体碰撞伤害。
• 第六关：三只巨神兵，每只 239 点血。击败第一只后，第二只从右侧落下；第二只剩余 100 点血或以下时，第三只从左侧增援。注意躲避低跳冲撞。
• 第七关：先击败两只雪山 Boss，再迎战三只巨神兵，最后摧毁原有关底核心。核心与下方炮台各 239 点血，炮台每轮炮弹加倍，未被摧毁的炮台会在连战中持续攻击。
• 第八关：最终心脏分为三个阶段，每阶段 239 点血；依次使用瞄准连射、需要趴下躲避的连续激光扫射，以及需要跳跃躲避的地面冲击波。
• 第二、第四关的电障碍会先触电，再死亡。

演出与设置

加入六人标题合照、选人立绘、组队开场、队伍合照与角色通讯，并修正过关立绘配色。水下八关采用原曲重混，经典八关音乐保持不变。
支持六种语言，游戏结束提示随语言切换；可设置起始关卡、生命、接关次数、初始武器与无敌模式。

游玩提示

用 Mesen 打开 Contra UnderWater.nes。更换新版后请重新启动游戏，不要读取旧版本的模拟器即时存档。

制作与致谢

改版制作：白河愁 / KRYSO。非官方爱好者作品，原作及相关素材归各自权利人所有。
感谢老猫和灼眼の双児参与测试。
特别感谢玩主小小虫、82 年电玩大叔（排名不分先后）。
部分数据来自 DimelNEX 制作的 ROM 改版《Contra - Heart of Galuga v1.3 [NES]》，在此致谢。
作者网站：http://www.ff18.com
QQ 群：1093320006
