Step 4

Orient all edges (~8 moves)

This can be trickier, however again you only need basic rules and no real 'algorithms'.

Orienting means to rotate a cubie so that it 'aligns with the center piece(s)'. An edge can be oriented in two ways, a corner in three. An edge that is correctly oriented will either be aligned already or can be aligned in one move (R of F in this case, when it's positioned in the empty slot).

Here's the simplest way:

  1. keep the unsolved edge in the RF position
  2. move R' or F so that the edge in the unsolved corner will be in the last layer with the color of the last layer aligned with the center piece of the last layer.
  3. move D to position another unsolved bottom layer edge into the empty slot
  4. repeat from 2 until all edges are oriented

You should be aware that you have 5 edges to orient in this step. It is not possible to have two edges incorrect, which leads to the conclusion that once you have oriented 4 out of 5 edges, the last edge will already be oriented.

Even better, if you have three last layer edges oriented, and the last one is in the 2nd layer, you're done as well: You can turn the cube so that R or R' would move the edge correctly oriented into the last layer, and you can consider it oriented.

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