
Upalu Mundi is a puzzle game set in a dwarven world at the dawn of railways. Lay tracks, build stations and set switches to keep goods moving and profits soaring. Read the news to see how the public reacts as you shape the future of transportation!
Modeled estimate, not a reported figure. How we estimate →
Discounts
Every price cut of more than 20% we have observed, in each market that quoted one, with this game's chart position on either side of it. These are episodes, not a model: a sale is one event, and one event cannot tell you what the next one will do.
Reviews, worldwide (the counter carries no country): 0.17/day in the week to Jul 21 → 0.2/day in the week after.
For scale, across Steam · Top Sellers · Brazil over the last 30 days: the 26 chart moves that followed a price cut of more than 20% went a median of 7 places towards #1, and the 2,400 moves with no price cut behind them went 2 away. One store, one chart, one country — it is the only place we have enough observations to say even that.
Prices outside the United States have been collected since 6 August 2026 and chart positions since 19 July 2026, so a cut older than that has no market to compare and a market that joined later has no history yet. Nothing here is converted between currencies.
About
In a dwarven world shaken by the invention of the locomotive, you take on the role of Pyrael, a trolley-cart network engineer at Mountain Mining Industries, E.C. As the company pushes into new regions, you find yourself in a unique position to shape the world around you.

Upalu Mundi draws inspiration from the challenge of efficiently linking producers and consumers in open-ended transport games, but distills these ideas into concise, self-contained puzzle levels. Using limited rail-switching logic on a neatly arranged 8x8 grid, each level offers a multitude of deterministic solutions. Working layouts are easy to grasp, but designing truly optimal networks requires ingenuity and experimentation.

Design - Lay tracks, build stations, and steer the flow of trains using switches. The R&D department is hard at work inventing more sophisticated technologies. Until then, you’ll have to make do with the four switch types once used for trolley carts in the mines.
Test - Before a transport network can go live, it must be validated on a simulation device. Push the throttle and watch your layout come to life as the miniature trains make their rounds on the model kit.
Optimize - Refine your blueprints until they align with the optimal line revealed by the mysterious workings of the Upalu Mundi, an iridescent gem that seems to hold the knowledge of the world.
Stay informed - Your decisions ripple through the world. Follow their consequences in the rich newspaper landscape, and browse the company’s meeting minutes to see what your coworkers have to say about your new look (and about any other issues on the agenda).
Engagement
Reviews
THE perfect track-and-signal zach-like game. Easy to finish, despairing to optimize.
This is a super cool game if you love optimization puzzles. From what seem like relatively simple track routing mechanics (admittedly it's still a bit intimidating to see at first but it's not too nasty) a variety of clever tricks arise. The actual crux of the game is about exploring the solution space and finding an optimized solution at every tradeoff of speed and cost. I suspect for some levels this might get a bit painful but if going for 100% optimized but I'm having a lot of fun so far (15 hours in I've got decent solutions for the whole of the first area but only about half at or above 100% optimized). It's a bit unfortunate that the game lacks global steam charts but I think just keeping the dev solutions as a target feels pretty good anyway.
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Stats
All-time low is the lowest price we've recorded for this game since we started tracking it.
Languages: English, German
Hours played at review time, across 20 reviews with recorded playtime.
For what it is and for what it is trying to do, upalu mundi is a true gem - pun intended, since the upalu mundi gemstone is at the heart of the story of this game. However, story is not at the heart of the game itself. Rather, it is a Zachtronic-like optimization game with what feels like endless levels and many mechanics to discover. The goal is not to find the one best solution in each level but to search for the many cost/time-optimized solutions in each one, and the game does a good job of keeping you at it with an aesthetically pleasing and narratively interesting leaderboard function. It feels rewarding to find multiple best solutions in a level and to inch closer to the wisdom of upalu mundi. And it's thrilling to find a solution that is even more efficient than what upalu mundi itself predicted. This being my first optimization game, i feel like I can say: one might not be a natural engineer but one can yet become an upalumancer. I also love the cozy aesthetics and especially the story elements which amount to a light-spirited yet satirical take on capitalism and our modern work life. In a way, the story elements and the game design (with its various combinations of mechanics and its intricate level design) actually go hand in hand: while the story subtly parodies the efficiency so high in demand in our economy and society, the game design pushes you to explore ideas instead of simply completing levels. On this Interpretation, the game design is in itself a critical reflection on today's performance-oriented work life - heck, on adulthood altogether, by undercutting efficiency and performance for the beauty of novel ideas and the satisfaction of wasting time by tinkering around with incremental variations. Also, really good value for your money: the first of four worlds already provided me with 20-plus hours of playing time (of course, you can advance much faster if you just go to the next level as soon as you've found a working solution for the level you were trying to solve). P.S.: some real railway companies should integrate this game into their mandatory training for railway operators (you thought of Deutsche Bahn, I did not say it).
Upalu Mundi is a rare gem indeed! It's a little bit rough around the edges, but it nails the gameplay. The puzzles themselves are fairly easy, at least so far, but you can try optimizing your solutions in true Zachtronics-like fashion. That's where the real challenge lies. Personally, I'm quite content to build inefficient and overly expensive railways because I just like to see the little trains choo-choo around the track, with the satisfying "dings" that come with picking up and dropping off workers and resources. A friend of mine with over 100 hours in the game kindly gifted this for me, so unfortunately my review won't be counted in the overall review score, but I definitely give it 10/10 dings!
This is a great puzzle game about optimizing railroad connections for transporting items between two points in a grid with constraints. It looks quite scary at first due to the busy UI and dense text, but it turns out to actually be based on pretty simple and straightforward rules and a small number of easy to use design tools. You don't even have to read the documents (though a lot of people will enjoy the snark) as the first batch of levels are bite-sized tutorials for the various elements of the game. You can also see in-game how well your friends did in each level compared to you! It seems to run just fine on Linux (Arch), so I imagine it will run fine on your Steam Deck.
Awesome train-themed game, where you are presented with lots of little optimization puzzles, which emphasize different (combinations of) mechanics. A few hours into the game, no two puzzles have felt "the same", each requiring a different approach. The scoring system encourages you to find as many different optimal or near-optimal solutions for each puzzle as possible, which I really enjoy. The feeling when finally reaching 100% on a puzzle is so good :D
If you like trains and puzzles, this is for you. The difficulty hits a good sweet spot, and reaching an optimal Upalu Mundi state after many iterations is very satisfying. The writing and world-building are fun as well.
[h1]Une pépite d'optimisation sur rails[/h1] Je suis loin d'avoir passé des tonnes d'heures sur ce titre, mais je voulais en parler rapidement puisqu'il est en réduction du 20 au 27 juillet 2026 dans le cadre du [i]Steam Train Fest[/i]. [b]À première vue[/b] [i]Upalu Mundi[/i], que l'on pourrait traduire par [i]L'Opale du Monde[/i], est un jeu qui m'a tout de suite attiré : trains + optimisation + [i]Zach-like[/i], ça avait tout pour me plaire. Lors de la prise en main, on remarque qu'il y a une grande attention portée aux détails. L'esthétique est travaillée (rappelant celle de [i]Into The Breach[/i]), et la documentation qui nous accompagne est soignée, parsemée de bribes d'histoire. De plus, lorsque l'on résout les puzzles, nous avons la possibilité de changer la fréquence de la radio (ce qui a pour conséquence de nous donner chaque fois un différent style musical). Un détail que j'ai bien apprécié. [b]Complexe, mais pas compliqué[/b] Comme le jeu est complexe (mais pas compliqué), il y a un tutoriel en bonne et due forme. Nous devrons obtenir une certification pour nous assurer que nous avons toutes les bases du jeu. Au début, il faut poser des stations à des endroits stratégiques pour transporter notre marchandise d'un point A à un point B. Notre programme se déroule comme suit : apprendre à bâtir les stations, apprendre à activer et désactiver les panneaux d'arrêt (les « stops », comme on dit, c'est-à-dire les moments où l'on charge/décharge la marchandise), apprendre à ajouter, retirer et modifier les trains, apprendre à faire changer de direction aux trains, apprendre le fonctionnement des interrupteurs, apprendre à installer les rails, et ainsi de suite. Votre objectif final sera d'optimiser (autrement dit, trouver une solution rapide et peu coûteuse). [b]Le plaisir d'optimiser[/b] Tant que votre solution fonctionne, ça va, mais si vous êtes comme moi, vous pourriez avoir honte de certaines de vos solutions et vous voudrez les refaire. Vaut-il mieux utiliser une seule locomotive qui peut tirer jusqu'à 5 wagons, ou 2 locomotives qui peuvent tirer jusqu'à 8 wagons ? À noter que les trains équipés de locomotives des deux côtés (au début et à la fin) peuvent faire le trajet inverse une fois leur course complétée (ce qui permet de gagner du temps). Si votre solution pourrait théoriquement fonctionner, mais qu'elle est trop longue, elle sera refusée et vous devrez continuer à l'optimiser. Il faut aussi apprendre à utiliser les signaux sur les rails (les flèches qui ajoutent une couche de complexité au jeu). Vous devez configurer ces flèches pour dicter le chemin précis que vos trains devront prendre. Il y a plusieurs options, mais pour faire court et donner une idée : à une intersection, vous pourrez dire à vos trains de toujours aller vers la droite ou de toujours aller vers la gauche. Vous pourrez aussi choisir l'option d'aller toujours vers la droite lorsque vos wagons sont vides, et toujours vers la gauche lorsqu'ils sont pleins (ou l'inverse). Avec plusieurs trains à gérer, c'est une option très intéressante pour optimiser. Chaque tableau complété vous donne un graphique pour vous montrer où vous vous situez en matière d'optimisation. Vous voyez aussi le résultat de vos amis sur Steam qui y ont déjà joué. [b]Les plus et les moins[/b] [b]Les plus :[/b] + Ce jeu a clairement été réalisé avec beaucoup de minutie. Visuels, design des puzzles, documentation, musique, tutoriel, graphiques, etc. Rien ne semble avoir été laissé au hasard. + Pour son petit prix, il offre un rapport qualité-prix difficile à battre. Vous en aurez facilement pour des dizaines d'heures (selon votre désir d'optimiser vos designs). + Les jeux d'optimisation s'adressent généralement à un public assez niché, mais j'imagine qu'ici avec la thématique des trains et la prise en main relativement rapide, cela pourrait plaire à un public plus large. + L'histoire n'est pas nécessaire, mais elle apporte un vrai plus. Chaque puzzle a sa page de présentation : ce n'est pas simplement une énigme à résoudre, mais un projet à compléter avec un but précis, ce qui donne un sens à vos actions. [b]Les moins :[/b] - J'aurais aimé avoir la possibilité de pivoter chaque grille/carte de gauche à droite pour parfois mieux voir la carte. Ce n'est probablement pas essentiel, mais dans certaines situations, cela peut aider à la résolution des problèmes. - Je ne sais pas pourquoi, mais j'ai parfois eu du mal à tracer les rails. Lorsque je les poses 1 à 1 ça va, mais si je veux faire un trait rapidement pour faire une ligne de rails, ce n'était pas aussi fluide que voulu. Peut-être aussi juste un manque d'habitude de ma part. - Le jeu est en anglais et en allemand, mais malheureusement pas en français. [b]Conclusion[/b] Il s'agit d'un excellent rapport qualité-prix et d'un titre à découvrir pour les amateurs de jeux de puzzle et d'optimisation. C'est un jeu qui mérite d'être beaucoup plus connu. [------[]---]Originalité [------[]---]Histoire [-----[]----]Graphiques [------[]---]Effets sonores et musique [---------[]]Valeur pour votre argent [-------[]--]Qualité des puzzles [-------[]--]Niveau de difficulté (selon si on optimise ou pas)
The visuals, theme, and vibe of this game are spot on. Glad I picked this up. It's definitely going to be one of those games that I point at when someone asks for something that needs more love from players.
4/4: Factorio-style train puzzles wrapped in a Zach-like are a match made in heaven See my full review: https://david.reviews/articles/upalu-mundi-review/ [quote]For more reviews, follow [url=https://store.steampowered.com/curator/45203122/]my Steam curator[/url] or peruse my dedicated review site: https://david.reviews/games/[/quote]
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