For a very cheap price, this, and the other games in the series kept me and my son amused for hours. Not for the faint hearted, if you are not a logical person, these games might be considered too time consuming. If you like a challenge, then this is for you. I would suggest that children under 16 might struggle with some of the maths needed, but other than that, brilliant.
The official review on this site amazed us, how such a brilliant set of challenging puzzles could have been given such a poor score is a puzzle in itself!
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Time Played: Over 20 hours
Difficulty: Very Hard