Pure logic, no luck

A quiet corner of the web for people who like thinking hard.

Mind Teasers collects grid puzzles that reward patience and deduction. Nonogram comes first; Sudoku, Kakuro, Slitherlink and Hashi follow.

The catalogue

Paint the hidden picture from number clues.

Fill the grid so every line and box holds 1 to 9.

A crossword built from sums instead of words.

Draw one closed loop around numbered cells.

Bridge the islands without crossing a line.