Fill the 9 by 9 grid so every row, every column and every 3 by 3 box has the numbers 1 to 9 exactly once. Tap a cell, then tap a number. Hold a number to place it in cell after cell. Turn on notes to pencil in candidates, use undo and erase freely, and take up to three hints that explain the move. A wrong number turns red and counts as a mistake: three mistakes and the chai spills. Every puzzle has exactly one solution. The level ladder starts gentle and adds one solving technique at a time, with a special stronger cup every tenth level. The daily puzzle is the same for everyone and gets stronger through the week: Cutting (easy) on Monday, Masala, Adrak (hard), and Kadak (expert) on Sunday. Quick play lets you pick any strength any time. Your progress is saved if you close the page.