The Grosse Book of Gogen Puzzles 1: 250 Uber- and Ultra-Gogen puzzles

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Finally, as an improvement suggestion for the presentation: if you put the clue words to the right of the grid, and the alphabet below it (with the given letters already crossed out), it's much easier to work the puzzle, whether in printed form or in graphics software.

Removed the remark from the question, as the puzzle is already in the "earning badges" level of points, as it should.

You can read about what happened to me in the book 'Let The Devil Wear Black' which I wrote under the pen name 'James F Linden'.

Most purchases from business sellers are protected by the Consumer Contract Regulations 2013 which give you the right to cancel the purchase within 14 days after the day you receive the item. As you go from puzzle to puzzle, first of all, the centre cell is left empty in the easiest, then another and so on until finally, you are down to just two clue letters, one of which is not in a corner so again, you only need logic to work out all of the letter positions. However, easy though they might be, there is a darker side to them - two types of Gogen puzzle that takes anywhere from a bit more thought right through to down-right difficult: the Uber-Gogen with deliberately omitted letters in the clues; and, the Ultra-Gogen where there are fewer and fewer clue letters in the puzzle, increasing in difficulty until there are only two puzzle letters left. The GoldenGogen is like the HyperGogen+ except that now, the clue cells can be right next to each other and the network of letters on the board is designed by hand. Every letter can be successfully located in the puzzles with absolute certainty - you just need to wrap your brain around each puzzle and apply some logic.

and even without using the remaining clue (FIR) we know the final empty spot must house the final missing letter, F.