A excellent collection. Ideal for everybody (noobs and experienced players). Varied and interesting tasks, well balanced difficulty (not hard, not easy) and very solid chambers ( I think that I found only out two or three minor unintended solutions).
Very well done and added to my favorites.

My favorite ones: Back to Basic, Transist, Strype, Shim-Sham, Wall(remake), One Way Street, More Thought, CH and Infnity Air.