This is a nice portable book - cheaper than a magazine. It may be that i knew what i was doing but i did not need the teach in section - it was just a way of buying a number of puzzles to do cheaper than getting the small magazines which i find hard to locate. Smiths dont seem to have them in stock so much nowadays. Anyway it was worth the purchase. The only down - if you could say it was a down - is that the first ones are soooooo easy and then you have a batch that are absolutely symetrical that there is reduced challange.
But if you like doing these puzzles buy the book - and then you need never be bored on a train again.