A picture-logic puzzle with a catch, some of the number clues are lying, so pure deduction has to include rooting out the fakes.
Each row and column carries number clues describing the runs of filled cells, and you shade the grid to reveal a hidden picture. The twist is that a few clues are false. You can't take any single hint on faith, you cross-check rows against columns to find the contradictions that expose which clues lie, then solve around them.
Row and column clues describing runs of filled cells, shaded to reveal a picture, is the nonogram — invented twice in 1987, by Non Ishida and independently by Tetsuya Nishio.
The original twist is that a few clues are false, so no single hint can be taken on faith.
A nonogram is normally solved by trusting each clue completely and intersecting what they force. Planting lies means the method has to change: you cross-check rows against columns hunting for contradictions, and the puzzle becomes lie-detection followed by an ordinary solve.
Phantogram is an original free browser game that twists the traditional picture-logic (nonogram) puzzle by planting false clues, adding a layer of lie-detection to the usual grid deduction.