Need help

Using Arduino Programming Questions
1

I have made using an arduino unoR3 and a 8 X 8 LED Matrix game (following these instructions:

https://create.arduino.cc/projecthub/juanma-alvarez-plaza/arduino-catch-the-beat-8x8-led-matrix-f464b0?ref=tag&ref_id=game&offset=9

) and I have slowed it down so its playable, but how do I get rid of the rapid flashing? Im sorry that half of it is in Spanish, but I managed to make out most of it. I have a video to show what happens If anyone want to get In contact to help me, thanks.

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