Apart from one grid you will get by with singles. The last grid has 3 X-wings but to make it easier Tarek has arranged that the digits to look for are all multiples of 3.
_________________ I have 81 brain cells left, I think.
As Glyn wrote: "Don't let Very Hard put you off." You get very far with N/H-Singles only. This is an excellent puzzle for anyone new to or inexperienced with X-Wings and who wants to get more experience with this technique.
Here a mini-mini Walktrough:
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Except for grid 4 this puzzles solves with N/H-Singles only. In grid 4 three X-Wings are required. I tried to look for a single technique for solving grid 4, but no one showed up.
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