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Mind Benders were originally written in 1978. The original puzzles remained in print as Books A1, A2, A3, A4, B1, B2, B3, B4, C1, C2 and C3 until 2010 and we still have copies of some of these for sale.
If you're a homeschooler using a curriculum where exercises are referenced by page numbers or a teacher who will be projecting the puzzles on to a screen you may prefer the earlier revision.
In the earlier printings of levels A1-B4 the puzzles and the solution grid were printed on facing paces. In the 2011 revision the puzzle and grid are printed on the same page. The saving in paper enabled twice as many puzzles to be included in each book for the same price.
The correspondence between the earlier and current printings is as follows:
- Mind Benders Beginning 1 reprinted as Mind Benders Book 1
- Mind Benders Beginning 2 reprinted as Mind Benders Book 2
- Mind Benders Warm-Up reprinted with a number of revisions as Mind Benders Verbal.
- Mind Benders A1 and A2 reprinted as Mind Benders Book 3
- Mind Benders A3 and A4 reprinted as Mind Benders Book 4
- Mind Benders B1 and B2 reprinted as Mind Benders Book 5
- Mind Benders B3 and B4 reprinted as Mind Benders Book 6
- Mind Benders C1 and part of C2 reprinted as Mind Benders Book 7
- Part of Mind Benders C2 and Mind Benders C3 reprinted as Mind Benders Book 8
In addition to the reformatting, dated puzzles were revised or replaced with new puzzles.
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