The right arrow increases the pen radius and the left arrow does the opposite. You can choose how fast you want to change the pen size changing by pressing a number. 1 is slowest, 9 is fastest (Other than c, which puts it to the default amount and is slightly faster than 9). You can stop the pen from changing color by pressing 0. The space bar clears the pen.
DON'T USE IF YOU HAVE SEIZURES AND STUFF LIKE THAT !!!!!!!!!!!!! DON'T SAY I DIDN'T WARN YOU!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Try increasing size to max and then holding the left click button and decreasing size! (I like it best with the slower color changing options.1)
