What is the toughest puzzle online?

i Color Lines Puzzle Game Pro is one of the toughest puzzles that you can play online.

What is the toughest puzzle online?

It is ten times more difficult than a classic version version of i Color Lines Puzzle game.
Seven colors make it a lot harder to keep up removing balls from the dashboard.
Even the best players in world earned about ten times less comparing to their score at the classic game.
If you like hard puzzles, this is is a game for you.

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