Every First Two Layers case for CFOP, with 3D playback, recognition tips and a learning order.
How to learn F2L algorithms
F2L (First Two Layers) solves each corner and its matching edge together after the cross. These 41 cases are a reference for one corner–edge pair, not 41 sequences you need to memorise before you can use intuitive F2L.
Recognising F2L cases
Find a corner with your cross colour, then find the edge with its other two colours. Their centre colours tell you which slot the pair belongs in.
Check where both pieces are: in the top layer, joined as a pair, or trapped in a slot. For top-layer pieces, notice which way the corner's cross-colour sticker faces and whether the upward-facing colours match.
Match the full corner–edge relationship to the case, not just a single sticker. A U turn can line the pieces up; a cube rotation changes which slot you are looking at.
A practical F2L learning order
Start with already paired pieces and basic insertions. F2L 11 and 12 in this library are useful right- and left-side starting points.
Next, practise separated corner–edge pairs in the top layer. Understand how to hide one piece, line up the other and join them before inserting.
Then work on corners with the cross colour facing up and cases with one or both pieces trapped in a slot. Preserve the cross and pairs you have already solved.
Add efficient alternatives for your awkward cases gradually. Learn back-slot insertions and look ahead at a slower turning speed rather than rotating for every pair.
Remembering algorithms and finger tricks
Explain each sequence to yourself as separate, pair and insert. Recreate the same case on a real cube and repeat it from different U-layer angles. Once the pair is reliable, practise spotting the next pair while completing the current insertion.