Hackers discover how to reprogram NES Tetris from within the game
Briefly

Now, some players are using that kill screen-and some complicated memory manipulation it enables-to code new behaviors into versions of Tetris running on unmodified hardware and cartridges.
Taking over a copy of NES Tetris is possible mostly due to the specific way the game crashes...a crash in NES Tetris happens when the game's score handler takes too long to calculate a new score between frames, which can happen after level 155.
Read at Ars Technica
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