Yukti, a daily logic puzzle at playyukti.com, has six kinds of puzzle. Each guide tells where the puzzle comes from, explains the method step by step, and works through a classic example from start to finish, so you can meet the daily puzzle knowing how to think about it.
How to solve river crossing puzzles
Kind of thinking: PlanningGet everyone across without leaving an unsafe pair alone. From Alcuin of York, about 800.
How to solve liars and truth-tellers
Kind of thinking: DeductionKnights always tell the truth, knaves always lie. From Raymond Smullyan, 1978.
How to solve logic grids
Kind of thinking: DeductionWork out who goes with what from a handful of clues. From the Zebra Puzzle and the Vetala tales.
How to judge an argument: sound or fallacy
Kind of thinking: ArgumentDoes the reason really reach the claim? From the Nyaya Sutras' faulty reasons.
How to play the counting duel
Kind of thinking: PlanningMake the last move by leaving your opponent on the right numbers. From Ashtavakra and Bandi.
How to solve Anekanta, points of view
Kind of thinking: PerspectiveSet a table so every seated person's view is true. From the blind men and the elephant, and Jain many-sidedness.