Corps of Discovery is a cooperative game that was on Kickstarter back in May 2024. This promised delivery in Jan 2025, and it was about 3 month late, arriving in late April 2025.

This looks like a thematic adventure/exploration game set the in era of Manifest Destiny and Lewis and Clark!  And it is NOT!  This is a deduction game, with bare hints of theme.  The text on the back of the box even hints at this being a thematic game:

“Take command of Lewis and Clark’s Corps of Discovery and lead them on a cross-country mission to explore the land … and kill demonic monsters.”

Sounds like a thematic exploration adventure, huh? Nope nope nope nope nope nope nope! Corps of Discovery is a deduction game! A cooperative deduction game, but a deduction game nonetheless! You need to know that going in or you will be severely disappointed by that description.

Let’s take a look!

Unboxing

Corps of Discovery is a pretty standard sized Ticket To Ride style box.

Now, we are showing the Ultimate edition of the game, which has slightly nicer components and a few expansions (see above).

The unboxing starts poorly, as you have to “fix” some maps in the game.

See above: as I have to X (or notate) which maps are bad.  Now, they aren’t full maps, there are just partial maps, so one side of the maps is good and the other side is bad!!  So, you still have to keep your “bad” maps, because one side is ok.   This started me off a little grumpy, but at least they fixed the problem.

The main part of the game, the key part of the game is the map holder above: in the Ultimate Edition, this is a beautiful wooden map.

There are some resource tokens (and a holder, which got very badly shaken up in delivery).

Underneath all that are BUNCHES and BUNCHES of maps!

There are different “themes” of folders with different maps: see the training mission folder above.

See the Flora map pack above.

See the Insecta map pack above.

See Vameter map pack above.

Coupled with these folders of maps are missions and the goals. See above.

Underneath all the maps are holders for the tokens for each Map pack.  Note that mine got shaken up a little, so the components are a little wonky.  I wish there had been a discussion somewhere of what all these things were, but you will figure it out … it could have been easier.

Basically, under each hard card are some components for the necessary map pack.

See above for some core components under the Core Game hard card.

The components are pretty nice, but you have to like the comic-book art style of the game. I do, but others may not.

The quality of these maps is a little flimsy, which isn’t a big deal if you are careful.

I was a little underwhelmed by the quality of the components, especially because of the errors on the maps! I did like the variety of maps, the comic-booky art, the wooden resources, and the wooden map holder. My friend Lon texted me after he got his copy: he was less than thrilled with the quality:

“I saw you posting about Corps of Discovery. I will say, I am not super happy with detail and packing quality. The manuals and the backs of the expansion tiles have different numbers of items (that is just bad), so I don’t know which is right. Also, I’m missing 8 tokens…at least I think so. Since I don’t have an actual list of the number of individual resources, but it looks like I’m missing several of those, plus I know I’m missing two water, and 1 Tipi. On top of that they had the errored maps and tokens, with I’ll say substandard ways to fix them (proxy the tokens, and to save a few pennies, we’ll have you “x” out the bad maps, so we can print 2 sheets instead of 4).”

Lon is also talking about the components page: it doesn’t give an accurate count of the resource tokens, so we don’t know if we got them all!!

You saw how messed up they were.  So, are we missing some?  I don’t know! They aren’t clearly enumerated the rulebook!

The component quality left a little to be desired, but I think Lon was grumpier about the components than I was.  The rulebook, however, left me MUCH grumpier than Lon.

Rulebook

I have not been this frustrated with a rulebook in a very long time.  The rulebook looks like it might be okay (it actually gets an A- on the Chair Test),  but for a deduction game where every word matters, this rulebook struggles to specify the rules well.

A few weeks ago, I didn’t love Soul Raiders, but I even reprimanded the rulebook for too many examples.  Oh, if only that were the case this week!

There was essentially ONE example on page 9; and it didn’t do a great job: the example crossed page boundaries, so it made it it harder to correlate the rule with the example.  It also was too small!  I struggled to read the page because it was a little too small in the rulebook! Also, some of the rules we so small because they were hidden in the text of the box!  

See Coke can above for scale: it’s too small!

This is a game where a single resource can make the difference between winning and losing.  Yet, there are so many places where things are poorly specified.    Some examples:

What happens when you discard a Challenge? (see Bait and Trap card above) Are there rules about which one? Can you discard one in progress?  Do you keep the path tokens for the next challenge that replaces it?  This makes a HUGE difference!   The summary icon page at the back of the rulebook DOES NOT show this and offers no explanation in the rulebook.

What happens when you add a Challenge?  (see Pass/Fail on Sweltering Challenge above).  Can you specify where the challenge goes in the day?  Before? After?  Can you put it to the front?  Can you choose NOT to add a challenge?  (Usually, you want to, but sometimes you want to move to the end of the day to reset all your Gear).  Again, there’s no specification anywhere and these rules make all the difference in the world.

What does the ?/Water notation mean?  See above on the bottom of the Landslide card.  I went spare looking for it! 

It’s not on the back page with the summary of icons!! See above!! I figured it could maybe mean three things:
1) discard a water or some other token (I think this is the actual interpretation)
2) make it so the minotaur lines don’t require lossage
3) lose a water ONLY IF it’s on the ? side, or off the board (or remove a ? water from the board)
This is one place where the token iconography failed: the ? side is useful for the players to “mark” what they think resources are.  Corps of Discovery conflates the meaning of ? to be “any single resource” and also “notate where a resource might be”.  Which is it? 

  

The final meaning is not where you expect it on the rulebook: I expected an explanation on the last page with the icons: NOPE!  It’s hidden next to the path rules and Monster Threat Effect on page 10????  It’s not even clear if it’s supposed to be a token?   It sure looks like it from the picture, but I have none of these tokens in my game!!

Another problem: this page 9, which is arguably most important page in the rulebook, does not specify all the rules that appear in the Training Scenario!  It alludes to some of the rules, but isn’t clear.   See this posting over on BGG: With a little help from the internet, I figured out what was going on here.  But I feel like this page needs to explain a few more rules.

In a thematic game, I don’t mind making a few snap judgements for rules, but deduction is all about precision.  This game needs an Index, more examples, more clarifications, and some rules need to be actually specified.

Gameplay

If I said this played like Minesweeper, would you get mad at me?  Players uncover spots of the board grid using deductive rules (board sideways to maybe not give any spoilers; each map is unique).  What’s revealed leads to more clues about what’s around you!

These spots have resources which you use to overcome challenges and monsters.

It’s Minesweeper, with resources and a lot more deduction rules.

10 Plays

I gave myself 10 plays to play the game: I played two of the Training Scenario, six of the Fauna Scenario, and two of the Flora Scenario.  This took place over two weekends with pretty much my the last weekend being consumed by this game.

I was able to beat the Minotaurs reliably in the Fauna scenarios after about 5 plays.

The Flora Scenarios kicked me around.  I lost.  Hard. And I didn’t have fun.

By the end, I was tired of looking for the fun in this game.  After my 10th game, I was done.

Randomness

Like I said, I was able to defeat the Minotaurs reliably after 5 games. But I noticed that my score ranged from 3 to almost a perfect score (27)!  I got “lucky” and just happened to have the right cards come out and the right resources emerge so I was just able to trounce the minotaurs!  This was right after a game where I barely won, and I got 3 points.  The score was more of a representation of “how lucky” I was; one game, I got lucky and obtained almost a perfect score! One game, where I got trounced by my Misfortunes, I won … but barely.   The score meant nothing:  It just noted how lucky I was.  To be clear, I didn’t play THAT differently between games.

In the Fauna games, the game felt VERY lucky; how far you could advance, and when you get the Flora Terrain tokens, just felt very lucky.  (Uncovering Flora tokens means you don’t get the resource, and you have NO IDEA if you will uncover a plain resource or a Flora resource).

In a game where Deduction is such an important part of the strategy, there seemed to be too much luck for me to want to come back to this.

Conclusion

I wanted to like this game so much.  I was initially a little disappointed that it wasn’t particularly thematic, but I still really like Deduction Games, so I was still so happy to move forward with what it was. A deduction game needs tight, well-written, and well-documented rules; sadly, that was not the case with this game!  The rulebook was one of the most frustrating rulebooks I have encountered in sometime.  To add insult to injury, I felt like a lot of scenario-specific rule were also under-specified.  Even powering through the rules and making the “best I can” with the rules as given, I found the game just too random for a game that just leans so heavily on hard deduction.

I gave Corps of Discovery so many chances; I forced my way through ten games, hoping to “finally” overcome the hump of rules.   But I rarely had fun playing: I was always just so angry at the randomness and poorly specified rules.  I am selling my copy. 

Maybe you’ll like it if you can power through it; maybe being forewarned about the pitfalls will help you like it.  Corps of Discovery has a really original premise, and it has some great ideas, but it just never came together for me.  Maybe it will for you.

EDIT: My copy has been sold.