这是一款双人合作的解谜冒险游戏。你和搭档要找到失联的潜艇“凯旋号”，并把取消打击的最新消息送过去，避免战争爆发。政府已经下令取消那枚可能引发全球大战的鱼雷，但潜艇已经超出通讯范围，没人能确认命令是否送达。两名潜艇部队的专家 Haurée 和 Leroy 被派去执行这项任务，而水下的水手们也因为鱼雷命令陷入了道德困境。
游戏需要两名玩家，各用一台设备。一名玩家购买游戏本体，负责进入潜艇内部探索、调查环境并与场景互动；另一名玩家通过免费的 Companion App 收集额外信息。两边看到的内容不一样，必须持续沟通，把各自掌握的线索拼起来才能解开谜题。游戏支持跨平台联机，两台设备可以是 PC 或手机。
谜题难度会随着流程逐步提升，需要逻辑推理、观察力和协调配合，沟通是通关的关键。操作本身比较简单，游戏流程是线性的，属于合作闯关而非自由探索。开始前，双方先确认设备和网络都就绪，第二位玩家提前装好 Companion App，进入游戏后再保持语音或文字通话，边玩边交换信息。
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