Can playing Tetris prevent flashbacks?

Yes, playing Tetris can potentially prevent flashbacks. According to Jane McGonigal, playing Tetris within six hours of witnessing a traumatic event can prevent flashbacks and lower symptoms of post-traumatic stress disorder (PTSD). This effect might be due to the game's ability to override visual memories, preventing the brain from obsessing over traumatic images. A new study suggests that even if the six-hour window is missed, playing Tetris up to 24 hours after re-visualizing the trauma can also be effective. This method could potentially help individuals who have been suffering from flashbacks for months or years 1.