У вашего броузера проблема в совместимости с HTML5
Preset: "2;95"
Just a quick video showing you guys how to make one of those "empty" worlds without using MCEdit. I should warn you that it does crash your game once, it also crashes whenever you place any other blocks on the invisible layer so watch out with water, sand and TNT ;) Other than that have fun with it :D
Music credits:
Song: CMA - Less Means More
Artist's Channel: http://youtube.com/epzonix
Texture Pack: http://bit.ly/NSAqc7
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