Change puzzle difficulty

This is the fourth Open Movie by Blender Foundation, re-rendered and re-graded in 4k resolution. (This is the HD scaled down version). Visit http://www.tearsofsteel.org for more information or downloads. All data for the film is available under Creative Commons Attribution. "Tears of Steel" was realized with crowd-funding by users of the open source 3D creation tool Blender. Target was to improve and test a complete open and free pipeline for visual effects in film - and to make a compelling sci-fi film in Amsterdam, the Netherlands. (CC) Blender Foundation - http://www.tearsofsteel.org Duration: 12 minutes. Age: Suitable for 12 years and older. Language: English spoken Production: Blender Institute Producer: Ton Roosendaal Director & Writer: Ian Hubert Director of Photography: Joris Kerbosch Composer: Joram Letwory Starring: Derek de Lint, Sergio Hasselbaink, Rogier Schippers, Vanja Rukavina, Denise Rebergen, Jody Bhe, Chris Haley Crew: Andreas Goralczyk, David Revoy, Francesco Siddi, Jeremy Davidson, Kjartan Tysdal, Nicolo Zubbini, Rob Tuytel, Roman Volodin, Sebastian Koenig, Brecht van Lommel, Campbell Barton, Sergey Sharybin. Project funding: Blender Foundation, Netherlands Film Fund, Cinegrid Amsterdam Premium Sponsors: Google, Rovi Corporation Main Sponsors: NVIDIA, Hewlett-Packard Workstations, Camalot AV Services, BlenderGuru. https://www.facebook.com/mango.open.m... (Facebbok page) https://plus.google.com/1120598235311... (Google+ page)