Use blocks from the More Blocks tab, the Control tab, and the Sensing tab to make a program that moves Sidney from start to end. Portals allow you to teleport across the stage area to one or many exit portals. Use the "if" block from the Control tab and the "touching [color]" block from the Sensing tab to have Sidney follow a different program depending on which portal he reaches.
Based on a design from MyCS_Student and the work of the students at Harvey Mudd College.