What is happening right now?

The Image of my Start Screen and classes https://prnt.sc/26gutjy

Looks like you are already decreasing the intervals to have them spawn more quickly. Just make sure you limit how much you can lower the intervals. After decreasing interval, check its value. For example: <Code Omitted> Also, I do not know if it is intentional or not, but only two intervals are decreasing with your code (interval3 is not decreasing anywhere; and, interval is decreasing in two places -- lines 33 and 54).

There is no reason why it cannot be done in greenfoot.

thanks again so much dude