I was stuck on level 3145 for several days until I broke down and turned to YouTube for help. All the videos there say you MUST get an extra tube to solve
Ball Sort Puzzle】Level.3145 - YouTube
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Water Sort Puzzle Tips, Tricks, and Cheats | Tips4Gamers
Ball Sort Puzzle - level.3145 - YouTube
Water Sort Puzzle Tips, Tricks, and Cheats | Tips4Gamers