---
product_id: 347733247
title: "Unfathomable | Strategy Game for Teens and Adults | Arkham Horror | Hidden Traitor Board Game | Ages 14+ | 3-6 Players | Average Playtime 120-240 Minutes | Made by Fantasy Flight Games"
brand: "fantasy flight games"
price: "NT$6980"
currency: TWD
in_stock: true
reviews_count: 13
category: "Fantasy Flight Games"
url: https://www.desertcart.tw/products/347733247-unfathomable-strategy-game-for-teens-and-adults-arkham-horror-hidden
store_origin: TW
region: Taiwan
---

# 4-6 hours immersive gameplay 3-6 players co-op voyage Hidden traitor mechanic Unfathomable | Strategy Game for Teens and Adults | Arkham Horror | Hidden Traitor Board Game | Ages 14+ | 3-6 Players | Average Playtime 120-240 Minutes | Made by Fantasy Flight Games

**Brand:** fantasy flight games
**Price:** NT$6980
**Availability:** ✅ In Stock

## Summary

> 🚢 Unfathomable: Where every wave hides a secret and every player could be your greatest threat.

## Quick Answers

- **What is this?** Unfathomable | Strategy Game for Teens and Adults | Arkham Horror | Hidden Traitor Board Game | Ages 14+ | 3-6 Players | Average Playtime 120-240 Minutes | Made by Fantasy Flight Games by fantasy flight games
- **How much does it cost?** NT$6980 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tw](https://www.desertcart.tw/products/347733247-unfathomable-strategy-game-for-teens-and-adults-arkham-horror-hidden)

## Best For

- fantasy flight games enthusiasts

## Why This Product

- Trusted fantasy flight games brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Unmask Hidden Traitors:** Experience the thrill of suspicion with cultists and hybrid Deep Ones secretly sabotaging your mission.
- • **Navigate Suspense on the High Seas:** Team up to manage supplies and fend off monstrous Deep Ones threatening the Atlantica.
- • **Balanced Challenge for Strategic Minds:** Perfectly tuned difficulty that rewards learning and teamwork over multiple sessions.
- • **Deep Strategy Meets Immersive Storytelling:** Dive into the Arkham Horror Files universe with rich narrative and complex gameplay.
- • **Gorgeous Components & Quality Craftsmanship:** High-quality plastic molds and stunning board design elevate your gaming experience.

## Overview

Unfathomable is a cooperative hidden traitor board game for 3 to 6 players set aboard the steamship Atlantica, blending strategic supply management and suspenseful gameplay. With 4 to 6 hours of immersive play, players must uncover cultists and fend off monstrous Deep Ones while navigating a richly thematic Arkham Horror Files universe. Praised for its balanced challenge, high-quality components, and deep narrative, it’s a must-have for millennial strategists craving intense social deduction and teamwork.

## Description

Embark on a journey of mystery and suspense aboard the steamship Atlantica in Unfathomable, the latest installment in the Arkham Horror Files series. As the vessel makes its way to Boston, dark shadows lurk beneath the waves, and the passengers seem unnaturally fixated on the sea. The investigators must grapple with suspicion and hidden loyalties as they navigate the treacherous waters, striving to uncover traitors and fend off the monstrous Deep Ones threatening the ship's safety. In Unfathomable, players must work together to manage supplies, battle swarming Deep Ones, and uncover the nefarious cultists or hybrid Deep Ones among them. With tension mounting and paranoia running high, every decision could spell the difference between survival and disaster. Will you uncover the truth and steer the Atlantica safely to its destination, or will the dark forces lurking below claim victory? Dive into the depths of mystery and intrigue with Unfathomable.

Review: Great co-op game with a great theme. - The is a co-operative game with a hidden traitor mechanics. I have two members of my family that hate traitor mechanics because it feels like they are lying, but with this game you can reveal any time you want. This creates less pressure. The game is very balanced. It usually takes us 4 hours to finish with the longest being 6 hours. The board is gorgeous. The plastic molds are good quality and the same with the cards. The first couple of times we lost to the deep but then we learned how to beat them. Certain characters work well together.
Review: Intriguing Challenge with a Learning Curve - Unfathomable is a captivating strategy game that offers a challenging and immersive experience for teens and adults alike. Set in the Arkham Horror universe, this hidden traitor board game keeps players engaged with its blend of strategy and intrigue. One of the game's strengths is its depth and complexity, providing a rich gaming experience that unfolds over multiple playthroughs. The hidden traitor mechanic adds an extra layer of tension and suspense, keeping players on their toes as they navigate alliances and suspicions. However, the learning curve for Unfathomable can be steep. New players may find it challenging to grasp all the rules and intricacies initially, leading to longer playtimes as everyone becomes familiar with the mechanics. Despite this initial hurdle, the game's depth and replayability make it a rewarding choice for those willing to invest time in mastering its strategies. Once players overcome the learning curve, Unfathomable offers hours of fun and strategic gameplay. Overall, Unfathomable earns a four-star rating for its engaging gameplay and thematic depth, with the caveat that it may require patience and multiple playthroughs to fully appreciate.

## Features

- INTRIGUING THEME: Dive into the Arkham Horror Files universe with Unfathomable, a game of hidden loyalties and devious strategy set aboard the steamship Atlantica.
- THRILLING GAMEPLAY: Work together with 3 to 6 players to navigate the treacherous waters, manage supplies, and fend off monstrous Deep Ones threatening the ship's safety.
- HIDDEN TRAITORS: Beware of fellow passengers who may secretly be cultists or terrifying hybrid Deep Ones, plotting to sabotage the voyage and drag the Atlantica to a watery grave.
- IMMERSIVE EXPERIENCE: Experience the tension of battling swarming Deep Ones while uncovering traitors, all while striving to steer the Atlantica safely to its destination in Boston.
- HIGH-SEAS SUSPENSE: With eerie underwater nightmares plaguing the investigators and suspicion running rampant, Unfathomable delivers a thrilling and immersive board game experience.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B096KW4QWX |
| Best Sellers Rank | #184,597 in Toys & Games ( See Top 100 in Toys & Games ) #4,865 in Board Games (Toys & Games) |
| Customer Reviews | 4.7 4.7 out of 5 stars (420) |
| Item Weight | 4.7 pounds |
| Item model number | UNF01 |
| Language | English |
| Manufacturer | Asmodee |
| Manufacturer recommended age | 14 years and up |
| Product Dimensions | 11.63 x 4 x 0.1 inches |
| Release date | November 12, 2021 |

## Images

![Unfathomable | Strategy Game for Teens and Adults | Arkham Horror | Hidden Traitor Board Game | Ages 14+ | 3-6 Players | Average Playtime 120-240 Minutes | Made by Fantasy Flight Games - Image 1](https://m.media-amazon.com/images/I/71P1yjvzFwL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great co-op game with a great theme.
*by B***U on April 13, 2025*

The is a co-operative game with a hidden traitor mechanics. I have two members of my family that hate traitor mechanics because it feels like they are lying, but with this game you can reveal any time you want. This creates less pressure. The game is very balanced. It usually takes us 4 hours to finish with the longest being 6 hours. The board is gorgeous. The plastic molds are good quality and the same with the cards. The first couple of times we lost to the deep but then we learned how to beat them. Certain characters work well together.

### ⭐⭐⭐⭐⭐ Intriguing Challenge with a Learning Curve
*by A***A on May 6, 2024*

Unfathomable is a captivating strategy game that offers a challenging and immersive experience for teens and adults alike. Set in the Arkham Horror universe, this hidden traitor board game keeps players engaged with its blend of strategy and intrigue. One of the game's strengths is its depth and complexity, providing a rich gaming experience that unfolds over multiple playthroughs. The hidden traitor mechanic adds an extra layer of tension and suspense, keeping players on their toes as they navigate alliances and suspicions. However, the learning curve for Unfathomable can be steep. New players may find it challenging to grasp all the rules and intricacies initially, leading to longer playtimes as everyone becomes familiar with the mechanics. Despite this initial hurdle, the game's depth and replayability make it a rewarding choice for those willing to invest time in mastering its strategies. Once players overcome the learning curve, Unfathomable offers hours of fun and strategic gameplay. Overall, Unfathomable earns a four-star rating for its engaging gameplay and thematic depth, with the caveat that it may require patience and multiple playthroughs to fully appreciate.

### ⭐⭐⭐⭐⭐ Great theme, wonderful mechanics, and can have nail biting action.
*by D***N on April 30, 2025*

Love this game. Enough content to have fun but not too heavy. Very good mechanics and of course a hidden traitor or two. We have a great time every time we play it

## Frequently Bought Together

- Unfathomable | Strategy Game for Teens and Adults | Arkham Horror | Hidden Traitor Board Game | Ages 14+ | 3-6 Players | Average Playtime 120-240 Minutes | Made by Fantasy Flight Games
- Fantasy Flight Games Unfathomable: from The Abyss Board Game Expansion - Deeper Peril on The SS Atlantica! Cooperative Horror Strategy Game, Ages 14+, 3-6 Players, 2-4 Hour Playtime

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*Product available on Desertcart Taiwan*
*Store origin: TW*
*Last updated: 2026-03-12*