The number in a tile shows, of how many tiles the block in question is made. Colour the entire playing field until there is no white tile left. At the end each number has to be within a block, whichis made of the exact tiles he states. If coloured blocks overlap, the marking will be removed.
Hint: Click and hold a tile, then lengthen or widen it, until the block has the correct quantity. After releasing the tiles will darken and mark the block. Sometimes it doesn't look like it, but all gamesare solvable.