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Containing item: "Thinking Outside the Sphere"
Best of TWP MapsCollection by David
I'm playing through the list of ThinkingWithPortals.com maps, collected by Lpfreaky. These are my personal highlights and favourites. It's a subjective business of course, but hopefully someone will find it useful.
KennKong's Favorite Puzzle MapsCollection by KennKong
These are the maps I've found that made me think the most. Some of them may be very hard to figure, but none require ninja skills. Don't to forget to rate these and visit the workshops of the original authors.