Studio BBB’s debut turns four emotions into a platformer’s entire toolkit, and the real trick is that every creature in the world can feel them too. One of the smartest puzzle platformers of the year.
A cozy label on a sharper game
I have a complicated relationship with the word “cozy.” On a Steam page it usually promises a gentle afternoon, a soft palette, and a design that asks very little of me. It’s a perfectly good promise. It just isn’t one that tends to keep me up past midnight.
MONOWAVE wears that label, along with “wholesome,” “relaxing,” and “cute,” and for its first hour it plays along. Then it quietly reveals that it’s something else. By the time I reached the credits, I had spent the full campaign solving puzzles that asked me to think about how a crocodile feels, and whether a sad whale is more useful to me than a happy one. I finished it convinced that the store tags undersell it, and that the trailers, which focus almost entirely on the little hero’s abilities, miss the best part of the game.
This is the first commercial release from Studio BBB, an independent team based in Seoul, co-published with Japan’s Phoenixx. It launched on September 16, 2026, on PC via Steam and on Nintendo Switch, with PlayStation 5 and Xbox Series X|S versions planned for later in 2026. I played it on PC.
What the game is about
You control Mono, a newborn Guardian spirit. The world has always been held in balance by the Prism Tree, which nurtures four Emotions: Anger, Anxiety, Happiness, and Sorrow. When the Emotion Shards inside the Prism vanish, the Emotions scatter across the land and the tree begins to wither. Mono’s job is to bring them home.
That’s the whole setup, and the game is comfortable with it. The adventure spans four regions, each warped by the Emotion that rules it. The Panic Jungle is a fog-choked realm consumed by Anxiety. The Somber Trench is all freezing currents and brittle ice. The Blissful Islands turn light, shadow, and gravity into obstacles. And the Anger region is exactly the place of heat and fire you’d expect it to be.
What the premise lacks in surprise it makes up for in coherence. Every region is a feeling given a map, and the design treats that literally from the first stage to the last boss.
Gameplay: the emotions are the moveset
On its own, Mono is a modest platforming hero who can walk and jump, and that’s about it. The four Emotions change that. You pick them up from flowers scattered through each level, and each one rewires how Mono moves.
Happiness boosts jump height. Anger lets Mono cling to walls and wall-jump. Sorrow melts the little spirit into a puddle that can slip through narrow gaps and flow through water. Anxiety heightens Mono’s senses, letting it spot traps and survive terrain that would otherwise hurt. As the adventure goes on, these abilities grow, and by the final region Mono’s moveset has become far more advanced than the opening hour suggests.
If that were all MONOWAVE did, it would be a pleasant, well-built platformer with a neat color-coded gimmick. Plenty of games have put a different ability behind each of four buttons. What lifts it is what happens when Mono sings.
The part the trailers barely show
Singing spreads Mono’s current Emotion to every spirit nearby, and those creatures change their behavior to match. There are 18 spirits in the game, each reacting differently to each of the four Emotions, which works out to 72 distinct interactions. That number is the real content of MONOWAVE.
A creature that snaps at you when angry might hurl you into the air when anxious. A whale that sinks to the seabed in Sorrow can shoot a spout of water skyward when it’s happy, and suddenly you have a platform. Parruff, a parrot convinced it’s a puppy, sings back, pushing its own Emotion onto Mono and onto every spirit in earshot, and that’s the kind of wrinkle that turns a tidy puzzle into a chain reaction.
The genius of the system is that it asks you to learn a language rather than memorize solutions. Early levels teach one spirit at a time. Later, the question becomes a matter of logistics: which Emotion does this animal need, how do I carry that feeling across the level without picking up a different one on the way, and which of my own abilities do I have to give up to deliver it? Getting the right mood to the right creature is often the puzzle, and simply reaching that creature while still holding the correct Emotion is a puzzle of its own.
I’ll be honest about how rarely that clicks this well in the genre. The best stages in the back half of the game ask you to chain three or four spirit behaviors together, mixing your own traversal with theirs, and working out the solution feels as good as executing it. Level design keeps the two halves of the game in conversation, too. Some stages lean on platforming, others on puzzle logic, and very few overstay their welcome.
The in-game Codices help enormously. Keeping track of every spirit’s four moods in your head would be impossible, so the menus catalog each creature you’ve met, alongside environmental objects and hazards. It’s reference material, but it’s also a record of how much of the world you’ve come to understand, which suits a game about empathy rather nicely.
Where it slips
The final stretch is where MONOWAVE loses some of its composure. A cozy art style and a gentle hint system sit awkwardly beside a handful of late precision platforming sections that demand far more exact timing than anything before them, and one boss encounter in particular spikes the difficulty in a way the rest of the game never prepares you for. These moments aren’t unfair in the sense of being broken. They’re simply out of step with the pacing that made the preceding hours so pleasant.
Movement also has a slightly floaty quality that becomes noticeable exactly when the game starts asking for pixel-level accuracy, and some hazard hitboxes feel a touch generous in the hazard’s favor. Checkpoints are frequent through most of the adventure, including mid-boss, which takes most of the sting out of it. There are still a few stretches where the spacing between them feels uneven, and those are the ones you’ll remember.
None of this sinks the game. It’s worth knowing, though, especially if you’re buying it for a younger player on the strength of the word “cute.”
The boss encounters
Each of the four regions ends in a boss, and each fight is built around its ruling Emotion, with the arena and the mechanics shaped by Anxiety, Anger, Sorrow, or Happiness. They’re closer to puzzle rooms with pressure applied than to traditional combat, which is the right call. MONOWAVE is a game about calming a feeling down rather than beating it up, and the bosses mostly respect that.
They’re also where the game’s ideas get compressed into their most demanding form. The first, at the end of the Panic Jungle, is a gentle exam on everything the opening region taught. The later ones are less forgiving, and as mentioned, one of them is the single hardest wall in the game.
Story: a sweet, quiet frame
There is no dialogue in MONOWAVE. Mono’s journey is told through short, wordless cutscenes between regions, and they look lovely in the house art style. Taken together, though, they add up to very little screen time, and anyone hoping for a fully realized narrative will be disappointed.
A good deal of the lore lives in the menus instead, in text entries about spirits, worlds, and the Emotion Spirits themselves. That’s an odd split. The cutscenes are almost too slight, and the written material is more detailed than most players will ever go looking for.
Still, the story does its job, and the theme underneath it lands better than the plot. The idea that anger, sorrow, and anxiety are part of what makes us whole, and that each has a use, is baked into the mechanics rather than stated in a monologue. A sad Mono is the only Mono that fits through that gap. An anxious one survives spikes. That’s a gentler and more persuasive message than any dialogue box would have managed.
Graphics and performance on PC
The art direction is the first thing anyone will notice, and it earns the attention. Studio BBB drew inspiration from the scratch art books many of us had as kids, where you scrape a black surface to reveal color underneath. Every character and landscape is bright neon line work against a deep black background, with simple, bouncy animation.
It’s not only pretty. Each Emotion has its own color, and every creature takes on that color when it feels something, so the art style doubles as the game’s user interface. You can read the state of a puzzle at a glance. Jungles and volcanic caverns are about as familiar as platformer biomes get, and this style makes them look new.
On PC, MONOWAVE is undemanding. Studio BBB’s recommended specification, an Intel Core i5-4570 or AMD Ryzen 3 1200 with a GeForce GTX 1050 Ti or Radeon RX 560 and 8GB of RAM, targets 1080p at 60fps, and the minimum spec aims for 720p at 30fps on hardware as modest as Intel Iris Xe integrated graphics. The install needs 4GB. There’s a macOS version with Apple M1 support as well.
It holds 60fps comfortably through almost the entire campaign. The busiest late-game stages, where several singing spirits, particle effects, and moving hazards share the screen, can shake the frame rate briefly. It never affected my ability to play, and it’s the kind of thing a post-launch patch should smooth out. A few small interface rough edges also point to a game that shipped slightly before its final coat of polish.
The black backgrounds make this a natural fit for an OLED panel, where the neon lines practically glow off the screen, and the scale of the art reads well on smaller displays. It’s easy to picture this becoming a favorite on handheld PCs.
Soundtrack and sound design
The original score is lively and varied, and each region has its own musical identity that locks into its Emotion. The Anger region’s percussion in particular becomes so tied to the color red that the association sticks with you after you’ve left.
The music is used cleverly in the closing moments of the game, which I won’t spoil. What I missed was a stronger link between the score and Mono’s own state mid-level. For a game built so thoroughly around moods, I wanted the soundtrack to react more obviously when I swapped from Happiness to Sorrow, and that’s a small missed opportunity.
The soundtrack is also sold separately on Steam as a DLC for anyone who wants it outside the game.
Player experience: length, co-op, and access
The main campaign lands somewhere between six and eight hours, depending on how quickly the spirit system clicks for you. Completionists will spend considerably longer. Every stage hides three smaller shards, and collecting them earns cosmetics for Mono, some of them genuinely funny. There are eight hidden stages, two in each region, reached through alternative exits. There’s also a Hard mode that cuts Mono’s health and adds more hazards, which is where the game’s sharper edges really come out.
The hint system is one of the best I’ve seen in a puzzle platformer. A meter fills the longer you’re stuck, and spending it highlights the next couple of steps, a glowing marker over the relevant spirit, for example, before switching off and letting you continue on your own. It never solves the whole puzzle. That respects the player far more than a full walkthrough button would.
Co-op is local, with the second player controlling the Prism, a floating shard that points out puzzle elements and collectibles rather than a second platforming character. It’s clearly designed for a parent sitting beside a child, stepping in when help is needed, and I think that’s a smart, generous idea. On PC, a controller is required for two-player mode, and Remote Play Together is supported, so a friend or relative elsewhere can join. Steam Achievements and Steam Cloud saves are both in.
One point matters specifically for readers here: MONOWAVE supports 10 languages, including English, French, Italian, German, and Spanish, but Portuguese isn’t among them. Because the game has no spoken dialogue and very little text outside its menus, this barely affects play. The lore entries in the Codices are where it’ll be felt.
Where it comes from
A little context makes MONOWAVE more impressive. The project won Best Student Game at the Taipei Game Show’s Indie Game Awards, which tells you where this team started. Games that grow from student projects often stay stuck at the level of a clever prototype, a single strong idea stretched thin over a full release. This one did the harder thing and built out the idea until it could carry four regions, 18 spirits, and a set of boss fights without running dry. The remaining rough edges are exactly the kind a first commercial release tends to have, and they’re far outweighed by what the studio got right.
Verdict
MONOWAVE takes a simple idea, emotions as abilities, and finds a second, much better idea hiding inside it: emotions as something you give to others. The spirit system is inventive, deep, and fully explored by the end credits, and the scratch-art presentation is both beautiful and genuinely functional. Its late difficulty spikes, slightly floaty movement, and slim story keep it short of greatness, but none of those flaws touch what makes it special.
Buy it if you love puzzle platformers that reward learning a system rather than memorizing jumps, or if you want something smart and beautiful to share with a younger player on the couch. Skip it if you need a strong narrative to stay engaged, or if precision platforming in the final hours is a dealbreaker for you. At under ten dollars, it’s one of the easiest recommendations of the year.
