---
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/.338"
currency: PAB
in_stock: true
reviews_count: 13
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 70+ cards & 22 detailed miniatures 3-6 players co-op & hidden traitor 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/.338
**Availability:** ✅ In Stock

## Summary

> 🚢 Steer the Atlantica or sink with secrets—can you outwit the deep?

## 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/.338 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

- • **Epic 2-4 Hour Gameplay:** Immerse yourself in long, strategic sessions that reward teamwork and cunning.
- • **Dive Deep into Suspense:** Navigate Arkham Horror’s chilling steamship mystery with every play.
- • **Rich Components & Design:** Gorgeous board, quality miniatures, and immersive cards elevate your game night.
- • **Master the Hidden Traitor:** Unmask secret cultists before they sink your crew—trust no one, reveal anytime.
- • **Strategic & Social Challenge:** Perfect for millennials craving complex co-op games that spark critical thinking and social intrigue.

## Overview

Unfathomable is a cooperative hidden traitor board game for 3-6 players aged 14+, set in the Arkham Horror universe aboard the steamship Atlantica. With 120-240 minutes of gameplay, it combines strategic resource management, social deduction, and immersive horror themes. Featuring high-quality components including 22 plastic monster figures and over 70 cards, it challenges players to uncover traitors and fend off monstrous Deep Ones in a tense, suspenseful experience designed to develop critical thinking 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 |
| Age Range Description | 3 years |
| Are Batteries Required | No |
| Best Sellers Rank | #180,852 in Toys & Games ( See Top 100 in Toys & Games ) #4,447 in Board Games (Toys & Games) |
| Brand Name | Fantasy Flight Games |
| CPSIA Cautionary Statement | No Warning Applicable |
| Color | Various |
| Customer Reviews | 4.7 out of 5 stars 424 Reviews |
| Edition | Standard Edition |
| Educational Objective | Develop critical thinking, strategic planning, and cooperative problem-solving skills |
| Game Mechanics | cooperative, hand management, hidden traitor |
| Genre | Cooperative |
| Global Trade Identification Number | 00841333113414 |
| Included Components | 1 Learn to Play, 1 Rules Reference, 1 Game Board with 4 Resource Dials, 22 Plastic Monster Figures, 10 Character Sheets, 3 Traitor Reference Sheets, 6 Player Reference Sheets, 10 Character Standees, 1 Current Player Token, 4 Traitor Rings, 9 Passenger Tokens, 1 8-sided Die,1 Travel Token, 1 Ritual Token, 14 Loyalty Cards, 70 Mythos Cards, 2 Title Cards, 20 Spell Cards, 20 Waypoint Cards, 20 Item C… |
| Indoor Outdoor Usage | Indoor |
| Is Assembly Required | No |
| Item Dimensions | 11.63 x 11.63 x 4 inches |
| Item Dimensions L x W | 11.63"L x 4"W |
| Item Type Name | Game |
| Item Weight | 2131 Grams |
| Language | English |
| Manufacturer | Asmodee |
| Manufacturer Maximum Age (MONTHS) | 900.0 |
| Manufacturer Minimum Age (MONTHS) | 168.0 |
| Manufacturer Part Number | UNF01 |
| Material Type | Cardboard |
| Minimum Age Recomendation | 168 |
| Model Number | UNF01 |
| Number of Items | 1 |
| Number of Players | 3 to 6 |
| Operation Mode | manual |
| Rulebook Availability | Printed Included |
| Set Name | Unfathomable |
| Size | Small |
| Theme | Horror |
| UPC | 841333113414 |
| Unit Count | 1.0 Count |

## 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.

### ⭐⭐⭐⭐⭐ Some Dagon Nice-Looking Cards!
*by B***E on March 17, 2022*

FFG is slowly winning me over with the new Descent, Arkham (board game, I’m not nuts!), and this surprisingly well-done mashup of traitor games and the tight action economy of their other coop titles. It’s like Dead of Winter and Mansions of Madness had a baby. A fun baby. Never played BSG, but this is apparently a reskin of a much-loved game transported to their Arkham Files world. But this time we have some new faces, which is nice. I’ve got nothing against Jenny the dilettante chick and the hobo with the dog guy, but seeing them turn up in every game gets a little old. Their miniatures are hit or miss; Mansions’ are terrible, new Descent’s are amazing. These are somewhere in between. The Deep Ones are meh but the two big monsters look great. I’ve seen this exact art of them in several other games but having them as big miniatures is a ton of fun. Some people have complained about the hodgepodge of art styles. While it’s true that the ship illustration on the board itself has a “bad Sketchup paint over” vibe, the card art and manual design is so insanely tasty that I found the game extremely nice to look at on balance. Be warned though, this is not Werewolf or even Dead of Winter-level gaming. There’s a good amount of stuff going on and keeping track of all the mechanics in effect and actions available to you is going to be a struggle if you’re not fairly deep into board gaming already. That said, there’s no reason you and/or your loved ones can’t learn and this would be a great place to start. Keep up the good work, FFG!

## 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: 2026-07-06*