In this task, the first step is to change the pen colour, so I'm going to find the set pen colour block and change it. It's already in the programme. You can choose any colour you like. Let's test that. I'm going to move crab with the arrow keys, and you can see my pen is now green. For the next step, we have to make the pen line thicker when the crab moves up, so we're going to use change pen size by. Now change pen size by is going to go into the up arrow code, so when I press the up arrow, the line will get larger. You can see the line's getting quite big now. Now to make the line smaller again, I'm going to need to add another change pen size by block. To make the pen size smaller again, I'm going to need to use another Change pen size by, and I'm going to put a minus one. The minus means that the value will decrease every time I tap the down arrow. So the line is still quite big because the line size didn't reset. But as the crab goes down, you can see the line is getting smaller, and as the crab goes up, you can see it getting larger. To add a reset function, which makes the pen go back to the starting size, we can use set pen size two, which is a different block. If we add the block to our setup code here and test it, that means that when the crab starts, the pen size will be small. When the crab goes up, the size will increase, and when the crab goes down, it will decrease.