1LINE one-stroke puzzles

"1LINE: One-Stroke Puzzles" is a brain-training game that challenges players to connect all dots in a level with just one continuous stroke. With hundreds of free puzzles and daily brain-training packs, players can improve their problem-solving skills and flexibility of thinking. The game boasts of its high difficulty, with only 1% of players able to complete some of its toughest puzzles. Hints are available to assist players when they are stuck.