Hi @lucienEn. Thank you for sharing the screen shots from debug mode. You said that the giraffe was made by using the sprite 1 and the ball (yellow and blue pixels respectively, I presume). Do you happen to know how they did manage to get the spacing for the ball so small? Please refer to my screenshot below for reference:
I have tried myself to do something similar but the gap is massive (9 color clocks as expected from doing 2 consecutive sta RESBL).
Are they using a 2x/4x ball and the sprite on top has "holes" that let the ball visible through? Like the following: