What you will learn
Inspect only the yellow stickers on upper-layer edges. A line has two opposite upper yellow edge stickers in addition to the center.
Before you begin
Set a clear front and upper face on your physical puzzle. If you are using the simulator, choose the appropriate cube size, then hold the same orientation before comparing moves. Review face-turn notation whenever a move symbol is unfamiliar.
Find the pieces or pattern
Inspect only the yellow stickers on upper-layer edges. A line has two opposite upper yellow edge stickers in addition to the center.
Try this short exercise
Distinguish a yellow line from an L-shaped case without moving the cube.
Check your result
Stop after the exercise and compare your real cube with the interactive 3D cube. Check neighboring face colors, not just the face closest to you. If the outcome differs, repeat slowly from a known position.
Corner stickers do not count when classifying the yellow cross edge pattern.
Take the skill into your next solve
Apply this lesson during one deliberate practice solve. Describe what you see before moving, make only the move you intended, and check the result. Confidence with piece recognition and reliable turns matters more than repeating a long sequence quickly.