H
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Euclidea
Geometric problems of increasing complexity with a nonlinear solution
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Pythagorea
A collection of geometry tasks for training memory and imagination
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XSection
Virtual simulator for working with polyhedra, lines and planes
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Pythagorea 60
Interactive puzzles to test knowledge of geometry
App Support
Suite 1802, Lippo Centre, Tower One, 89 Queensway, Admiralty, Hong Kong