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Exploration

Find the 4 cubes and bring them to the exit area to leave the level.

Sounds simple, doesn't it? Well, its not an easy map, but its not really a hard map either. I estimate the difficulty around Medium (5/10) which is slightly above Valve Difficulty.

I hope you have fun solving it. To my knowledge there is only one solution. If you think you found an unintended solution, I'd love to hear from you. Don't forget to use spoilers in your comments though. :)

*VERSION HISTORY*
1.0 - Initial Release.
1.1 - Small patches based upon the comments.
~.~ - fixed one exploit.
1.2 - Again fixed one exploit, for real this time.
1.3 - Added a few lights here and there to improve the light conditions.
1.4 - Added a fix for an exploit, added a ditch for the sphere.
1.5 - Another exploit fixed, although it wasn't necessary as it was hard to accomplish by itself and normally should be enough motivation for people to consider it impossible, it was requested several times to fix.
1.6 - Another exploit fixed.