Mario Kart World

Pick a Mario Kart track. The choice does not matter much; what matters is that the reader has driven it before, at some point in the last thirty years, on whichever console was around at the time. Now think specifically about the moment in the lap where the player has to brake. Not where the track says to brake. Where the body knows to brake. The point where, after enough laps, the body's foot or thumb or finger triggers the brake input before the conscious mind has registered that the corner is coming. Most readers of this essay have, in some part of their nervous system, this specific kind of body-knowledge for at least one Mario Kart track. They have not used the knowledge in years, possibly decades. They could, if they sat down with the right console, recover it within a lap or two.

This is the part of the cultural conversation about Mario Kart that the standard vocabulary about "muscle memory" or "nostalgia" has been mishandling for thirty years. The body's knowledge of Rainbow Road is not a metaphor and not exactly muscle memory in the conventional sense. The knowledge is a measurable physical change in a specific region of the player's brain, built by the franchise across thirty-three years of carefully designed repeated tracks. The change is the substrate of what the player has been calling skill. The change is also, on the available cognitive-science evidence, increasingly rare in the contemporary mass-cultural environment, and the Mario Kart franchise has been one of the small commercial places where it has still been getting built.

Mario Kart World, the 2025 entry that converts the franchise from a circuit-track structure into an open-world driving environment, has stepped away from the conditions under which the brain-building was happening. The new game is competent. The new game is fun. The new game also cannot, by structural design, deliver the specific neurological change the older form was delivering, and the part of the franchise's longtime audience that has been quietly disappointed has been responding to this absence without having had the vocabulary to name what is missing.

The frame this essay wants to give the reader: cultural forms that reward repeated practice of specific skills, across years, are building measurable physical changes in their audiences' brains. Most contemporary cultural forms are not built this way anymore. The forms that still are, including parts of the Mario Kart franchise and parts of a few other long-running game franchises, are doing something that almost no other element of the modern adult cultural environment is doing. Recognizing this matters because it changes what the loss looks like when a franchise drifts away from the practice-rewarding form. The loss is not nostalgia. The loss is cognitive substrate.

The neuroscience this argument depends on is some of the most-replicated and least-controversial work in the cognitive sciences of the past half-century. John O'Keefe, the University College London neuroscientist who won the 2014 Nobel Prize in Physiology or Medicine for this work, published in 1971 the foundational paper that established the framework. O'Keefe and his student Jonathan Dostrovsky had been recording from individual neurons in the hippocampi of rats running through small mazes. The recordings revealed that specific neurons fired only when the rat was in a specific location. A given neuron was silent everywhere except a small region of the maze; once the rat entered that region, the neuron fired reliably. Other neurons fired only in other small regions. Across many recordings, O'Keefe established that the hippocampus contained a population of neurons whose collective firing encoded the rat's specific position in space. He named them place cells.

The discovery has been confirmed many times in many species, including humans, across more than fifty years of subsequent research. The hippocampus is doing real-time spatial mapping at the level of individual neurons. The mapping is built up through bodily presence in the environment. The mapping persists, in stable form, long after the body has left the environment. The mapping is, in the strict neurological sense, what humans call memory of place.

The most-cited human extension of this work is Eleanor Maguire's 2000 study of London taxi drivers. Maguire was interested in whether intensive spatial memory practice produced observable structural changes in human hippocampi. London taxi drivers were the natural test population because of "The Knowledge," the famously demanding examination London cabbies are required to pass before they can drive a black cab. The Knowledge requires applicants to memorize the entire London street system, all twenty-five thousand streets, plus the optimal routes between any two points. Maguire's MRI study compared the hippocampi of qualified taxi drivers to those of matched controls. The qualified drivers had structurally larger posterior hippocampi, and the size correlated with the number of years the driver had been practicing. The brain region had grown. The growth was a direct response to the spatial-memory work the drivers had been doing for years.

This is the cognitive operation the Mario Kart franchise has been performing in its players' brains for three decades. The franchise's repeated tracks, driven across many laps, across multiple entries, across the player's accumulated life, lay down place-cell representations in the player's hippocampus that are structurally indistinguishable from the place-cell representations the brain builds for any real spatial environment the body has been in. The Rainbow Road in the player's brain is, neurologically, in the same category as the route to the player's childhood school or the layout of the apartment the player first lived in alone. The brain does not, for these purposes, distinguish between real and fictional spaces. It encodes spatial relations and lays down the neural representations the spatial relations require.

This is, in passing, why the Mario Kart franchise produces the specific kind of cultural-emotional attachment it produces. The franchise's audience has been carrying around a small library of fictional place-cell representations for years. Each new entry that brings back a remixed version of an older track activates the existing neural representation, which is why the body remembers when to brake before the conscious mind has registered the corner. The activation produces a small specific feeling that the casual conversation has been calling nostalgia. The feeling is not nostalgia in any reductive sense. The feeling is the recognition of a working spatial memory the brain has been holding for the player for decades, suddenly being given something to do again.

What the franchise's repeated circuit structure has been doing, in K. Anders Ericsson's now-canonical vocabulary, is what the expertise-research literature calls deliberate practice. Ericsson, the late Florida State University psychologist whose research program on expertise dominated the field for forty years before his death in 2020, established that expertise in any complex domain is built not by general practice but by deliberate practice: the specific kind of practice that targets the limits of current ability and pushes against them in structured, repeated ways. The musician practicing a difficult passage at slow tempo until it becomes accurate, then gradually speeding it up, is doing deliberate practice. The chess player working through standard openings until the moves come automatically is doing deliberate practice. The Mario Kart player learning the third corner of Rainbow Road through repeated failure until the brake input becomes automatic is, in Ericsson's strict sense, doing deliberate practice.

The deliberate practice is what builds the System 1 expertise Daniel Kahneman documented in Thinking, Fast and Slow (2011). The skilled driver, the skilled pianist, the skilled chef, the skilled Mario Kart player are all bodies whose System 1, in Kahneman's vocabulary, has absorbed activities that System 2 originally had to consciously perform. The conscious mind has moved on to other things. The body knows what to do.

This is the cognitive substrate the franchise has been building, mostly without naming it, for thirty-three years. The substrate is not a small thing. Most contemporary cultural products are not built to produce it. The streaming platform's algorithmic feed does not reward repeated attention to a single piece of content; the algorithm prefers a steady churn of new content. The social-media platform does not reward sustained engagement with a single conversation; the platform prefers many shallow interactions across many conversations. The mobile game does not reward deep skill-building; the mobile game's economic logic typically prefers monetizable engagement loops that do not produce the structural cognitive change deliberate practice would build. The contemporary leisure environment has, across the past two decades, become structurally less deliberate-practice-rewarding than the leisure environment of any previous adult generation in the developed world.

The Mario Kart franchise, in its older circuit form, was one of the small surviving commercial sites where deliberate practice was happening. The audience that grew up with the franchise has, in many cases, used the franchise as one of the rare opportunities in their lives to do the kind of skill-formation Ericsson's literature documents as one of the species' distinctive cognitive capacities. The cognitive capital deposited by this practice is real and durable. It does not disappear when the player stops playing. It sits in the player's hippocampus, intact, available for retrieval the next time the player picks up the controller.

Mario Kart World, the 2025 open-world entry, has stepped away from the conditions that produced this. The open-world structure, by design, does not concentrate the player's repeated travel into a small number of fixed routes. The player drives through a continuous map whose features the player encounters in different combinations on different sessions. The structure rewards exploration, variety, and contextual responsiveness. The structure does not, by its own logic, support the lap-after-lap repetition that built the franchise's older expertise. The brain still builds a generic spatial map of the open world, in the way it would build a map of any unfamiliar large environment. The brain does not, however, build the specific, deep, lap-time-relevant representations the circuit structure produced. The deliberate practice substrate is gone.

This is the disappointment the franchise's longtime audience has been struggling to name. The audience is not, in any meaningful sense, mourning the limited geographic variety of the older games. The audience is missing the experience of building, and then accessing, deep spatial-skill representations in their own brains. The audience is missing the cognitive substrate the older form was producing. The new form has its own pleasures, but the pleasures are different in cognitive kind from the old ones. The audience can feel the difference even when the conversation about the difference has been almost entirely about surface design choices.

The reader who finishes this essay can carry several useful frames forward. The first frame: when a long-running game franchise changes its core structure, ask not whether the new version is "better" or "worse" on entertainment-quality measures, but whether the new structure rewards the same kind of cognitive practice the old structure rewarded. The two structures may be incomparable. The Mario Kart World vs. Mario Kart 8 question is not, on the cognitive evidence, an evaluation of two versions of the same thing. It is a comparison of two structurally different things, one of which built place-cell expertise across years and one of which does not.

The second frame: the cultural products in the reader's own life that have built durable cognitive capital are worth recognizing for what they have done. The piano lessons that produced procedural memory. The driving routes that built the place-cell representation of the city. The chess openings that automated decision patterns. The Mario Kart tracks the body remembers. These are not trivial pieces of the reader's cognitive life. They are part of the reader's actual neural inheritance from the activities they spent time on. The contemporary culture is, on the available evidence, structurally less likely to produce more of them. The ones the reader has are worth treating as the achievements they are.

The third frame: when the next entry of any beloved franchise is announced, the question worth asking before reading the marketing copy is whether the new entry will continue building the cognitive substrate the older entries built. The marketing copy will not usually name this directly. The design choices the studio has made, when reported, will. An entry that promises "more variety," "open-world exploration," "no two playthroughs the same" is unlikely to build the substrate. An entry that promises "refinement of the existing form," "the same tracks with new variations," "improvements to the existing mechanical vocabulary" is more likely to.

The third corner of Rainbow Road in the 1992 original is still in the brain that drove it thirty years ago. The body remembers what the franchise built. Whether the franchise's coming entries continue building this kind of substrate, or whether the open-world drift continues, is a question the next decade will answer. The cognitive evidence is available to anyone who wants to use it. The audience's hippocampi are, against the surrounding cultural conversation's older vocabulary, real, and the brain-building the form has been doing is one of the few small ways the contemporary leisure economy has been making its audiences cognitively richer rather than poorer. The forms that do this deserve to be recognized for what they are. The forms that do not deserve to be recognized for what they have stopped doing.