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Once you've worked out the basics (which might take some people 20 or 30 minutes on initial play), you can easily treat it as a casual game. The individual puzzles aren't that big, you have a lot of freedom about the order to tackle them in (or which ones to do at all, if you go for the easier endgames) and it's easy to abandon one challenge if you're stuck and try a different one.
Wow, what a legendary reply. Thanks hugely. It sounds like quite an investment in time and energy, which is probably why I haven’t bought it yet.