Color Flow — free browser game

The aim is to connect every pair of colours on the grid with an unbroken path from one end to the other, and at the same time fill all the cells — no square may be left empty, and paths must not cross. Hold your finger or the mouse on an endpoint and drag toward neighbouring cells to extend the path; if you accidentally run into another colour, its path is automatically cut from that point, and if you drag back over your own path you undo its last section. You can erase a path entirely by tapping its colour again and pulling from the start, reset the current level with R, or open a brand-new puzzle with N. When all the colours reach their correct ends and the grid is completely full, the level is over and your move count is logged to your record. Tip: connect the colours near the corners and edges first, because that leaves more flexible space for the colours in the middle; also, route the long colours around the short ones to be careful not to leave isolated empty cells.