---
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: "B/.295"
currency: PAB
in_stock: true
reviews_count: 12
category: "Fantasy Flight Games"
url: https://www.desertcart.com.pa/products/347733247-unfathomable-strategy-game-for-teens-and-adults-arkham-horror-hidden
store_origin: PA
region: Panama
---

# 120-240 min epic sessions Arkham Horror universe, immersive steamship setting 3-6 players, hidden traitor intrigue 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:** B/.295
**Availability:** ✅ In Stock

## Summary

> 🚢 Unravel secrets, outwit traitors, and survive the deep—if you dare!

## 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?** B/.295 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.pa](https://www.desertcart.com.pa/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

- • **Co-op with a Twist:** Collaborate while suspecting—reveal traitors anytime to ease the tension.
- • **High-Quality Components:** Gorgeous board and durable plastic molds elevate your game nights.
- • **Deep Strategy, Real Suspense:** Navigate treacherous waters with hidden traitors lurking among you.
- • **Immersive Arkham Horror Lore:** Step aboard the Atlantica and dive deep into a chilling, thematic experience.
- • **Epic Playtime, Endless Replay:** 120-240 minutes of intense gameplay that rewards strategic mastery.

## Overview

Unfathomable is a 3-6 player hidden traitor strategy board game set in the Arkham Horror universe. Designed for ages 14+, it offers 120-240 minutes of immersive cooperative gameplay aboard the steamship Atlantica, where players manage supplies, fend off monstrous Deep Ones, and uncover secret cultists. With high-quality components and a rich narrative, it challenges players to balance trust and suspicion in a thrilling, suspense-filled experience.

## 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 | #94,625 in Toys & Games ( See Top 100 in Toys & Games ) #2,386 in Board Games (Toys & Games) |
| Customer Reviews | 4.7 4.7 out of 5 stars (418) |
| 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 Panama*
*Store origin: PA*
*Last updated: 2026-02-12*