I've found this 7x7 skyscraper sudoku and i don't know how to even get started on it!

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`2 5`

+---+---+---+---+---+---+---+

5 | | | | | | | |

+---+---+---+---+---+---+---+

| | | | | | | |

+---+---+---+---+---+---+---+

| | | | | | | |

+---+---+---+---+---+---+---+

3 | | | | | | | | 4

+---+---+---+---+---+---+---+

2 | | | | | | | |

+---+---+---+---+---+---+---+

2 | | | | | | | |

+---+---+---+---+---+---+---+

3 | | | | | | | |

+---+---+---+---+---+---+---+

5 4 5

Usually with no givens, i start looking at possibilities for the highest skyscraper.

So if i put in 7s in all possible places it looks like this:

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`2 5`

+---+---+---+---+---+---+---+

5 | | | | | 7 | 7 | |

+---+---+---+---+---+---+---+

| 7 | 7 | 7 | 7 | 7 | 7 | |

+---+---+---+---+---+---+---+

| 7 | 7 | 7 | 7 | 7 | 7 | |

+---+---+---+---+---+---+---+

3 | | | 7 | 7 | | | | 4

+---+---+---+---+---+---+---+

2 | | 7 | | 7 | | 7 | 7 |

+---+---+---+---+---+---+---+

2 | | 7 | | 7 | | 7 | 7 |

+---+---+---+---+---+---+---+

3 | | | | 7 | | 7 | 7 |

+---+---+---+---+---+---+---+

5 4 5

But i totally fail how i could now eliminate more options. Looking at the 6s surely won't help as there would be way more options.

So what am i missing here?

Can someone help me get started? Or point me to a page with advanced skyscraper sudoku solving techniques?

Much thanks,

.dom