The Tetris Effect (Definition + Examples)

In 1984, Russian computer engineer Alexey Pajitnov came up with a simple game. It allowed players to rotate and drop four-block shapes into place to create orderly rows. Tetris was an instant success and is still one of the most addictive games ever created. But the popular game comes with a surprising side effect found in popular psychology. “The Tetris Effect” can affect more gamers than just Tetris players. If you enjoy video games, be aware of The Tetris Effect and how your video game habits may be affecting your brain.

What Is the Tetris Effect? 

The Tetris effect, or Tetris syndrome, occurs when something that we focus on for extended periods of time starts appearing in our thoughts, perceptions, and dreams. The term was coined by journalist Jeffrey Goldsmith in his Wired magazine article “This Is Your Brain on Tetris” in 1994.

After focusing on Tetris for longer periods, many players experience something strange. They start seeing forms that can be flipped and arranged, just like in the game, in everyday objects such as cereal boxes or buildings. They keep on thinking about ways that different shapes around them could fit together. In a way, their minds continue playing even after they have finished the game.

tetris effect meat example

And that’s not all. 

For some players, the Tetris effect manifests itself in hypnagogic hallucinations, imagined yet realistic sensations that occur during the transition from wakefulness to sleep. The recognizable tetromino shapes and images of falling blocks often pervade Tetris players’ dreams.

This phenomenon is known as the Tetris effect.

Tetris Dreams

A few years after the publication of Goldsmith’s article, a psychiatry professor and sleep researcher Robert Stickgold and his team at Harvard Medical School conducted an experiment to see how playing Tetris can influence our thoughts and dreams. They asked the participants to play the game for several hours before going to sleep. The group consisted of beginners, experienced players, and people suffering from anterograde amnesia who were unable to make new memories. 

The results of the experiment were remarkable. Sixty-three percent of the participants, and two thirds of the inexperienced players, reported seeing tetromino images as they drifted off to sleep and having the familiar shapes appear in their dreams. And when they were awake, Tetris blocks were still lingering in their vision. 

Surprisingly enough, the amnesiacs had the exact same experience. Although they had no memory of playing the game, their dreams were invaded by images of Tetris. The study indicates that forming these images must be related to procedural memory. This is a skill-related memory that is created when we practice a sport or play an instrument, for example, and that is intact in people with severe amnesia. 

Below is an example of the tetris effect at work:

Tetris Effect child's ear goldfish

Examples of The Tetris Effect

When a Reddit user introduced the idea of The Tetris Effect to the Tony Hawk Pro Skater subreddit, users replied with how the effect of Tetris and other games affected their perspective! If you are a gamer, this post, and its comments are super relatable!

u/smoke_woods said: “I have this but for skyrim. I’ll dream about skyrim, see bushes and flowers and plants and be reminded of that stuff in skyrim, etc. it’s wild. My girlfriend has said I’ve said stuff about it multiple times in my sleep 😂 no joke

EDIT: I have it for THPS as of late too since I’ve been playing a ton of it on Switch. Still obsessed with Skyrim tho lol”

u/Banana_King123 said: “The Tetris Effect has happened to me 3 times in my life. Once with Tetris when I used to play Tricky Towers all the time, once with Bejeweled 3 when I used to play that a ton, and most recently THPS 1+2. Going for lvl 100 and doing those hard get there’s definitely lead to the Tetris effect for me. Didn’t go away until maybe a week after achieving platinum. I think it’s an interesting concept.

u/Arkneryyn said: “I make music and if I stay up late working on a song I’ll dream that I’m still working on it lol. Also totally had this with THPS at certain point in my life same with a few other games, had a bunch of dreams where I’m building an empire in civilization lol.”

What Causes the Tetris Effect? 

The floating pieces that Tetris players observe when they are not playing are cognitive afterimages. A cognitive afterimage is a kind of optical illusion where an image continues to appear in front of our eyes after the exposure to the actual object is over. 

When we play Tetris for hours on end, our brain starts creating new neural pathways that allow us to recognize patterns with less effort and get better at the activity. Our brain, as it were, helps us practice the game even when we are not playing. 

tetris brain

Studies on the Tetris Effect

One of the earliest studies on the Tetris effect was conducted by American psychologist Richard Haier at the University of California in 1992. He discovered the brain consumes less energy as players’ game skills improve. Haier showed that regularly playing Tetris results in increasing the thickness of the cerebral cortex, which makes the brain more efficient. 

Haier also demonstrated that Tetris affects the brain’s plasticity, that is, the ability to change and adapt due to experience. It turns out that this captivating game can promote cognitive development, enhance memory capacity, and generally contribute to keeping our brains healthy. There are benefits to playing video games! But there are drawbacks, too. The more you know about this effect, the easier it will be to look out for signs that The Tetris Effect is improving your brainpower or having less-than-great effects.

Game Transfer Phenomena

The Tetris effect belongs to the game transfer phenomena. The phenomenon was defined by British psychologist Mark Griffiths in 2011 as a transfer of game experiences into the real world. 

The influence that repetitive actions have on our perception of reality is typical of many other games besides Tetris. Speedcubing, solving a Rubik’s cube as fast as possible, or doing jigsaw puzzles can have a similar effect on our brains. These games can modify our visual impressions and the way we use logic. Professional gamers often find that the strategy and actions they take in a game affect their thought patterns in the real world.

Examples of Game Transfer Phenomena

Reddit users have also experienced general game transfer phenomena! The Casual Impact subreddit has some pretty funny examples of how it has affected their behaviors and decisions.

u/TwistedSystems said: “So shortly after the release of Inazuma I decided I’d speedrun the new quests. Now, I rarely play for more than an hour in one go so playing this game for hours was an exception for me. Suddenly, the delivery guy calls he’s gonna be here in a few mins, so I get ready to receive my package. (They can’t just drop it off on doorsteps here but we have to sign a document that we got it.) But I couldn’t find my door keys! So, naturally, I tried to use Elemental Sight because the key would surely glow white, right?”

u/kaichoices said: “never heard of game transfer phenomena but i once tried to catch a butterfly by clicking the non-existent F key irl once. it just looked…really similar to a genshin butterfly okay.”

u/4eyedfreak96 said: “I don’t know if this counts but right after playing any game for a while, talking to anyone in my house feels like I’m talking to an NPC and I kinda have this urge to “skip” dialogue. 😂”

You can read through the whole post and its comment section here!

Does Playing Tetris Help Your Brain? The Benefits of the Tetris Effect

The Tetris effect occurs whenever we spend a lot of time on an activity that involves repetitive images, thoughts, or movements. In many cases, this effect can be used to our advantage. It can help change habits by choosing what we want our brains to focus on.

Improving sleep

Studies suggest that sleep quality can be improved with the help of the Tetris effect. The key is to train our minds to concentrate on relaxing thoughts and images associated with sleep. Once the brain is used to focusing on these images repeatedly, we are less likely to get distracted by stressful thoughts. Repetitive actions like meditating or even visualizing Tetris blocks falling into place will instruct our brain to recognize these moments as prerequisites for sleeping. 

Overcoming negativity bias

We naturally remember negative experiences better than pleasant ones. This tendency is known as negativity bias. The Tetris effect, which in itself is a form of habit, can be used to help us pay more attention to positive things. It can function as the brain’s defense against negativity bias. For example, by regularly practicing gratitude we can train our brains to remember the positive sides of events and get rid of the negative mindset.

Dealing with trauma

The Tetris effect is increasingly being used as a tool in mental health research. Psychologists at Oxford University and the Karolinska Institute in Sweden have found that playing Tetris may interrupt processes that would otherwise embed traumatic events in the memory. 

A dissociative state that the game creates blocks the formation of long-term memories that could lead to post-traumatic stress disorder. The parts of the brain that would normally form these memories are being filled with the spatial puzzle. As a consequence, the person playing the game shortly after a distressing event would remember Tetris patterns instead of the traumatic experience.

How To Stop the Tetris Effect

The Tetris Effect and game transfer phenomena can make for some really funny stories, but getting too caught up in video games can eventually affect your life in negative ways. If you want to step outside of the Tetris Effect, use these tips: Step away from the game. Choose a different activity that challenges other skills. Reading, writing, and coloring are all nice hobbies that don’t require a computer screen. Try a body scan meditation or another form of mindfulness that will distract your brain. 

Notice how these changes take your mind off the game and give you something else to focus on. You may find yourself thinking about the characters of your book at night. That’s okay! As you explore other ways to wind down, you’ll find a balance that eliminates The Tetris Effect.

How Long Does the Tetris Effect Last?

Within a few days of putting down your game, you’ll notice that the Tetris dreams go away and that you stop seeing everything as an opportunity for Tetris. The more you play the game, the more your brain will be focused on “playing the game” even after you have logged off or stepped away from your gaming device. 


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Practical Psychology began as a collection of study material for psychology students in 2016, created by a student in the field. It has since evolved into an online blog and YouTube channel providing mental health advice, tools, and academic support to individuals from all backgrounds. With over 2 million YouTube subscribers, over 500 articles, and an annual reach of almost 12 million students, it has become one of the most popular sources of psychological information.

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