Hard Puzzles 

Your objective is to place some diagonal mirrors into the grid.

If a ray of light is shone in to the grid from each of the letters, and allowed to bounce off the internal diagonal mirrors, each will exit the grid at the twin of the letter that it entered the grid. For example, a ray entering at either letter D will bounce off some mirrors and exit the grid at the other letter D.

Each row and each column will contain exactly two of the diagonal mirrors.

Puzzle Copyright © Elliott Line
This puzzle appeared in Mensa's EnigmaSig (196.26) and is used with permission.

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Complete the grid such that every row and column contains the digits 1 to 6.

All squares that are connected contain the same digit.

Puzzle Copyright © Johan de Ruiter
Visit www.puzzlepicnic.com for more Staircases Puzzles.

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Using all of the letters A to Z, each once only, complete these words:
-e-er --eue --o ma- -p-a-e- -erso- ---k-am-on -ouse -a- -ur- ---igent

Puzzle Copyright © Kevin Stone

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Fill in the missing numbers with the digits 1 to 9. A diamond shape in the middle means that the four numbers around it add to 20.

Each uses a different way to add to 20, i.e. if there is already 1 + 3 + 7 + 9, then there will not be another using the digits 1, 3, 7 and 9 (in any order).

The same digit isn't allowed to touch, even diagonally.

Puzzle Copyright © Elliott Line
This puzzle appeared in Mensa's EnigmaSig (195.08) and is used with permission.

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