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Oubliettes is a logic puzzle. Each grid hides a dungeon: work out where every wall is from the clues, with no guessing needed. Every grid has exactly one solution. <b>Rules</b> <ul> <li>The numbers along the edge give the number of walls in each row and column.</li> <li>Monsters and chests are never walls.</li> <li>Every monster sits in a dead end, and every dead end holds a monster.</li> <li>Every chest is in a treasure room: 3×3 open cells, one chest, one opening.</li> <li>Elsewhere, hallways are one cell wide and the whole dungeon is connected.</li> </ul> <b>Features</b> <ul> <li>Campaign: 250 levels that are the same for everyone, in five difficulties (6×6 to 14×14), all open from the start.</li> <li>Endless: randomly generated grids in the difficulty you pick.</li> <li>Daily: one dungeon a day, the last two weeks always open.</li> <li>Tutorial: lessons you solve step by step, one technique at a time, then practise alone.</li> <li>Hints that teach: where to look, then why, then which cells.</li> <li>Share a solved grid as text, without its solution, and dig the one a friend sent.</li> <li>Drag to fill a row or column, undo and redo, progress and history saved after every move.</li> <li>Screen reader support, a magnifier and two-finger zoom for large grids, plain digits and a calm mode without animation.</li> <li>Endless grids are generated on the device. No ads, no tracking, no account.</li> <li>Original medieval music loops and sound effects, with volume sliders.</li> </ul> The app never uses the network: it does not ask for the Internet permission.