No puzzle here ever needs a guess.
The numbers are the lengths of the filled runs in that row or column, in order, with at least one empty cell between them.
4 2 on a row of ten means four filled, a gap, then two filled — somewhere in those ten. Where exactly is what you have to work out.
Fill every cell the numbers demand. When the filled cells are exactly the picture's, it is finished and named. Crosses are only notes to yourself; they never count against you.
A drag locks to the row or column it first moves along, and nothing is placed until you let go — drag back to shorten it. The clock starts at your first mark.
A clue goes grey when its line matches it. A clue goes red when what you have filled or crossed makes it impossible — there is no arrangement left that fits. It never says which cell is wrong, only that something is. That is the difference between losing two minutes and losing twenty.
Puzzles lists all of them, with their size and how hard the solver rates them. An unsolved puzzle keeps its name until you finish it, and your best time on each is kept. Today's is the puzzle of the day, the same for everyone.
Every picture here is checked by a solver before you see it, and none is included unless it can be finished one line at a time. You will never have to try a branch and see how it goes. If you are stuck, there is a line somewhere with something left to say.