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I don't have the instructions handy, but basically you follow the numbers in the colored blocks.
So, if you see 2(in green), 3(in green), there would be 0+ spaces, 2 green blocks, 1+ space(s), 3 green blocks, 0+ spaces. If you see 2 sections of the same color next to each other, there has to be at least one blank space.
If you see 2(in green), 3(in black), 4(in red), you would have 0+ spaces, 2 green blocks, 0+ spaces, 3 black blocks, 0+spaces, 4 red blocks, 0+ spaces. Sections of different colors may or may not have a blank space between them.
You pick the colors in the upper right hand corner of the screen.
Hope this helps. The game is pretty good, though there is no rhyme or reason on the target times and star ratings. Same for the sudoku. Ones that are supposed to be hard are easy. Ones that are supposed to be easy are harder.