Pierre Berloquin is a French engineer who graduated form the Ecole Nationale Supérieur des Mines, Paris in 1962. He is a freelance writer and had like Martin Gardner a regular science columns in French magazines. He has a special interest in games and logic puzzles and published many books on these topics.
The present collection appeared originally around 1973, was collected and translated by Pierre Berloquin and first published in this form in 1976. It is now reproduced by Dover in 2015 together with a similar collection 100 Numerical Games. Martin Gardner in his foreword announces this booklet is one of a collection of four, the other two dealing with logical and alphabetical puzzles as they were originally published by Charles Scribner's Sons, New York. For a copy of the latter two one should try to find an original most probably to be found in antiquarian or second hand book shops, unless Dover has plans to also republish those in the future.
Technically speaking these are puzzles, not games, so that the title can be a bit misleading. In practice, each puzzle is printed on a separate page with an illustration by Denis Dugas. There are few exceptions when two puzzles fit on the same page. Since the puzzles in this case are geometric, the drawings are essential in almost all the cases. There is some repetition in the type of puzzles. For example several mazes are included where the question is to fnd a path from A to B. There are also several match-stick puzzles: how to rearrange a pattern of matches to obtain a different pattern replacing only a specified number of matches. Also variations of the 8 queens problem on a chessboard do appear, or finding the one figure that differs from the others in a set of replicas.
The puzzles are not very difficult so that the reader does not need any mathematical training to solve them. They are the kind of mild brain teasers that one finds in the puzzle corner of a newspaper. They are called geometric because they involve patterns and graphs, but they never require a theorem from geometry to solve them. All the solutions are collected at the end of the booklet. An easy going puzzle book that, thanks to Dover, is saved from oblivion.