Sorry, I just presumed everyone has played this game at some point as it was quite a popular game 20 years ago.
I will try and explain it as best as I can.
Say you have buttons A and B.
You have to push them in sequence, 1 to 2 (A to B)
You can't push A and B at the same time, each time you push A and B it say adds 1% to a progress bar, the higher the progress bar goes up the faster player moves. I done the tile movement by 1 pixel movements so its not moving much.