The puzzles below are current daily and contest puzzles. These puzzles are competitive and you have to register to solve them and participate in the competition. To register click Login link in the top right corner.
You can use the scores page to see the results of other competitors for the daily puzzle.
All the puzzles from the previous days are available at our archive page. Puzzles which are older than 5 days do not affect the score table and can be attempted without registration.
Author: Anurag Sahay
Insert a digit from 1 to 6 into every cell, so that each digit appears once in each row and column . Each digit in a cell represents the height of a building. Numbers outside the grid indicate either of two quantities - how many buildings of even height a distant observer could see or how many buildings of odd height a distant observer could see in that row or column (both quantities may have the same value). A building will hide any shorter buildings behind it. Clues are unlabeled - which skyscrapers they represent has to be determined as the puzzle is solved.
Grid control: Click at a cell reveals the value chooser. Click at the selected value changes the state of the cell. More details about grid control are at the help page.
Author: Anurag Sahay
Place light bulbs in selected white cells so that each white cell is illuminated. Light bulbs illuminate every white cell in all four orthogonal directions until blocked by a black cell. No light bulb can be illuminated by another light bulb. Clue numbers correspond to the number of light bulbs in the four orthogonally adjacent cells.
Grid control: Click the mouse button at the selected cell to set/remove a bulb. Second click will put auxiliary cross sign, which doesn't affect correctness of the solution, but helps visually You also can draw a line to mark illuminated cells. More details about grid control are at the help page.