You will find that this activity book has a good balance of easy and hard puzzles.
Unexplained Aliens and UFOs by Baker, Theo
This activity book makes a great companion for lazy Sunday afternoons.
Unexplained Aliens and UFOs, Grades 5 – 9 Hardcover Theo Baker
What stands out about this activity book is the sense of accomplishment it gives.
Unexplained Aliens and UFOs, Grades 5 – 9 Hardcover Theo Baker
You will find that the illustrated diagrams explain things clearly.
