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This is defaulted to 15 such actions. While he was tasked with testing the capabilities of new hardware, his ambition was to use computers to make people happy.
In , while trying to recreate a favorite puzzle game from his childhood featuring pentominoes ,   Pajitnov imagined a game consisting of a descent of random pieces that the player would turn to fill rows.
Pajitnov presented Tetris to his colleagues, who quickly became addicted to it. Pokhilko eventually banned the game from the Medical Institute to restore productivity.
Pajitnov recruited Vadim Gerasimov , a year-old high school student who was known for his computer skills. Pajitnov wanted to export Tetris , but he had no knowledge of the business world.
His superiors in the Academy were not necessarily happy with the success of the game, since they had not intended such a creation from the research team.
Pajitnov offered to transfer the rights of the game to the Academy, and was delighted to receive a non-compulsory remuneration from Brjabrin through this deal.
In , Brjabrin sent a copy of Tetris to Hungarian game publisher Novotrade. Gary Carlston, co-founder of Broderbund , retrieved a copy and brought it to California.
Despite enthusiasm amongst its employees, Broderbund remained skeptical because of the game's Soviet origins.
The company's goal was to make people want to buy a Russian product; the game came complete with a red package and Cyrillic text, an unusual approach on the other side of the Berlin Wall.
At the time, it made no mention of Pajitnov and came with the announcement of "Made in the United States of America, designed abroad".
Tetris was a commercial success in Europe and the United States: Mirrorsoft sold tens of thousands of copies in two months,  and Spectrum HoloByte sold over , units in the space of a year.
Stein, however, was faced with a problem: the only document certifying a license fee was the fax from Pajitnov and Brjabrin, meaning that Stein sold the license for a game he did not yet own.
Stein contacted Pajitnov and asked him for a contract for the rights. Stein made several trips to Moscow and held long discussions with Elorg representatives.
In , Spectrum HoloByte sold the Japanese rights to its computer games and arcade machines to Bullet-Proof Software 's Henk Rogers , who was searching for games for the Japanese market.
At this point, almost a dozen companies believed they held the Tetris rights, with Stein retaining rights for home computer versions.
The same year, Nintendo was preparing to launch its first portable console, the Game Boy. Nintendo was attracted to Tetris by its simplicity and established success on the Famicom.
Stein agreed to sign a contract, but explained that he had to consult Elorg before returning to negotiations with Rogers. Rogers arrived at the Elorg offices uninvited, while Stein and Mirrorsoft manager Kevin Maxwell made an appointment the same day without consulting each other.
At that point, Elorg was faced with three different companies seeking to buy the rights. During this time, Rogers befriended Pajitnov over a game of Go.
Pajitnov would support Rogers throughout the discussions, to the detriment of Maxwell, who came to secure the Tetris rights for Mirrorsoft.
One of the clauses defined a computer as a machine with a screen and keyboard, and thus Stein's rights to console versions were withdrawn.
Nintendo, however, maintained its position. In this case, the initial license would authorize Atari Games to release the game.
The central argument of Atari Games was that the Famicom was designed to be convertible into a computer via its extension port.
This argument was not accepted, and Pajitnov stressed that the initial contract only concerned computers and no other machine.
Sega had planned to release a Genesis version of Tetris on April 15, , but cancelled its release during Nintendo and Atari's legal battle;  fewer than ten copies were manufactured.
Through the legal history of the license, Pajitnov gained a reputation in the West. He was regularly invited by journalists and publishers, through which he discovered that his game had sold millions of copies, from which he had not made any money.
However, he remained humble and proud of the game, which he considered "an electronic ambassador of benevolence". He realized that there was no market in Russia for their programs.
In , Pajitnov and Pokhilko emigrated to the United States. In April , as agreed with the Academy ten years earlier and following an agreement with Rogers, the rights to Tetris reverted to Pajitnov.
Pajitnov now receives a royalty for each Tetris game and derivative sold worldwide. The Tetris Company now owns all rights to the Tetris brand, and is mainly responsible for removing unlicensed clones from the market;   the company regularly calls on Apple Inc.
In December , Electronic Arts acquired Jamdat, a company specializing in mobile games. As a result, Electronic Arts held a year license on all mobile phone releases of Tetris ,  which expired on April 21, Tetris has been released on a multitude of platforms since the creation of the original version on the Electronika The game is available on most game consoles and is playable on personal computers, smartphones and iPods.
Guinness World Records recognized Tetris as the most ported video game in history, having appeared on over 65 different platforms as of October Since the s, internet versions of the game have been developed.
However, commercial versions not approved by The Tetris Company tend to be purged due to company policy. This has resulted in the availability of a large number of ports for different platforms.
Within official franchise installments, each version has made improvements to accommodate advancing technology and the goal to provide a more complete game.
Developers are given freedom to add new modes of play and revisit the concept from different angles. Some concepts developed on official versions have been integrated into the Tetris guidelines in order to standardize future versions and allow players to migrate between different versions with little effort.
In the intellectual property of the license belongs to Blue Planet Software. Maya daughter of Rogers supervises licenses to developers controlling their products .
In computer science , it is common to analyze the computational complexity of problems, including real life problems and games.
It was proven that for the "offline" version of Tetris the player knows the complete sequence of pieces that will be dropped, i.
Also, it is difficult to even approximately solve the first, second, and fourth problem. To prove NP-completeness, it was shown that there is a polynomial reduction between the 3-partition problem , which is also NP-complete, and the Tetris problem.
The earliest versions of Tetris had no music. The Blue Planet Software and Tengen versions also feature original music, with the exception of an arrangement of " Kalinka " in the Tengen version.
In the s, The Tetris Company added as a prerequisite for the granting of the license that a version of "Korobeiniki" be available in the game.
According to research from Dr. Richard Haier, et al. As Tetris players become more proficient, their brains show a reduced consumption of glucose, indicating more efficient brain activity for this task.
Another notable effect is that, according to a Canadian study in April , playing Tetris has been found to treat older adolescents with amblyopia lazy eye , which was better than patching a victim's well eye to train their weaker eye.
Robert Hess of the research team said: "It's much better than patching — much more enjoyable; it's faster, and it seems to work better.
Tetris can cause the brain to involuntarily picture Tetris combinations even when the player is not playing the Tetris effect , although this can occur with any computer game or situation showcasing repeated images or scenarios, such as a jigsaw puzzle.
While debates about Tetris's cognitive benefits continue, some researchers view it as a milestone in the gamification of education.
In January , an Oxford University research group headed by Dr. Emily Holmes reported that, for healthy volunteers, playing Tetris soon after viewing traumatic material in the laboratory reduced the number of flashbacks to those scenes in the following week.
They believe that the computer game may disrupt the memories that are retained of the sights and sounds witnessed at the time, and which are later re-experienced through involuntary, distressing flashbacks of that moment.
The group hoped to develop this approach further as a potential intervention to reduce the flashbacks experienced in post-traumatic stress disorder but emphasized that these are only preliminary results.
Consider yourself warned". I shudder to think of the blow to our economy as computer productivity drops to 0".
Noting that Tetris was not copy-protected, he wrote "Obviously, the game is meant to find its way onto every American machine". The reviewers gave the game 4.
Macworld summarized their review by listing Tetris' pros and cons, stating that Tetris is "Elegant; easy to play; challenging and addicting; requires quick thinking, long-term strategy, and lightning reflexes" and listed Tetris' cons as "None.
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