Solve the Second Layer Edges

What can we use if we don't have a standard 3x3 Rubik's Cube for this activity?

Use a 3x3 cube app on a phone/tablet or a physical 3x3 substitute (magnetic or speed cube) and follow the same moves, especially turning the top face (U) in Step 3 to position the top-front edge.

The edge still doesn't match after I did the algorithm—what likely went wrong and how do I fix it?

If the edge is wrong after doing U R U' R' U' F' U F or U' L' U L U F U' F' once (Steps 4–5), check you had the correct top-front edge in place per Step 3, then return that piece to the top and repeat the exact algorithm for the correct left or right slot.

How can I change the activity to suit different ages?

For younger kids (about 4–7) have an adult guide and count each turn while working on one middle edge at a time (Steps 3–7), and for older kids (8+) encourage memorizing the two algorithms and timing how quickly they can place all four edges.

How can we extend or personalize the activity after solving the second layer?

Turn it into a challenge by timing all four middle edges, decorate the cube or write a short note for DIY.org explaining which left/right algorithm you used for each edge and why.