Google in many countries like India, china is displaying a special logo doodle celebrating Tetris.

The text says  “Celebrating 25 Years of The Tetris Effect – courtesy of Tetris Holding, LLC”, and its linked to a search for tetris.

Wikipedia knows: “Tetris … is a puzzle video game originally designed and programmed by Alexey Pajitnov. It was released on June 6, 1984”.

Download free classic Tetris Game:  Click Here

The Tetris effect occurs when an activity to which people devote sufficient time and attention begins to overshadow their thoughts, mental images, and dreams.

It is named after the video game Tetris. In the game a player rotates and moves different falling tetrominoes, or shapes made up of four adjacent square blocks. If the player can arrange the shapes so there are complete horizontal lines of blocks without any gaps, those lines are eliminated. The object of the game is to eliminate as many lines as possible before the shapes fill the screen.

They might also see images of falling Tetris shapes at the edges of their visual fields or when they close their eyes. In this sense, the Tetris effect is a form of hallucination.

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