Need help

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

) 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.

You need help
We need your code

Please copy it from your IDE and post it here using code tags when you do

Have you read read this before posting a programming question ?