Puzzling Stack Exchange
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Question-and-answer site where members post original riddles, lateral-thinking problems, cryptic puzzles and mathematical brain teasers. Answers are voted on and explained step by step, so browsing the archive shows how experienced solvers attack unfamiliar puzzle types.
More resources on Puzzles & Brain Teasers
Puzzle Baron
Puzzle collection site offering logic grid puzzles, cryptograms, acrostics, drop quotes and word searches, playable online or printable. Timed scoring and leaderboards let solvers track speed and accuracy against other players as they build deductive technique.
Art of Problem Solving: Intro to Puzzles
Sharpen problem-solving skills with engaging puzzles and brain teasers! Learn introductory logic and strategies with AoPS's "Intro to Puzzles" course.
Logic Puzzles
Sharpen your mind with logic puzzles! This course teaches you to think critically and solve challenging brain-teasers.
The Great Book of Puzzles and Teasers
Collection of 75 original logic puzzles built around truth-tellers and liars, tournaments, and everyday scenarios. Each entry supplies clues, a guided solution and a full answer, so solvers pick up systematic deduction techniques rather than only checking results.
braingle.com
Braingle is a comprehensive online hub for brain teasers, riddles, logic puzzles, and trivia, featuring thousands of user-submitted puzzles, daily challenges, and interactive puzzle games.