Time to create the bottom block. We'll start by creating a variable for the height.

• Click on the PYTHON tab. Go to and drag Integer Variable inside the interval() event.
• Change the name of the variable (the word before the = sign) to bot_height.
• Change the value (after the = sign) to 350 - top_height.

Now we will always have a gap of 350 pixels to move the bike through.

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