Portal Remote Control Mastery is a level I made in Portal 2.
The Design Goal for this level are:
- Players have one cube as a key for the puzzles from the beginning till the end.
- Progressive sub-levels.
- Combining multiple higher-level mechanics such as Lasers, Excursion Funnels and Gels with lower-level mechanics such as Pressure Plates and Portals.
- Focus on the puzzles instead of actions.
- Multiple use of the same type of objects.
Here is the video: