The Best Logic Puzzle Games of All Time (and Where to Play Them Online)
From Nikoli's paper classics to modern browser reinterpretations, here are the logic games worth learning — and the ones we're building next.
Logic puzzles have a longer history than most people realize. The classics have survived for a reason: their rules are tiny, their depth is enormous, and every solve is earned.
Sudoku
Still the standard-bearer. Its rules fit on a matchbook and the difficulty range is enormous — from three-minute warmups to hour-long killers. Learn a few techniques and see our Sudoku strategy guide for the ones worth knowing first. Play a fresh board every day in our Sudoku game.
Nonograms (Picross)
Draw pictures by deducing which cells in a grid are filled, using number clues on each row and column. The moment the image emerges is one of the great satisfactions in puzzles.
Slitherlink
A single loop, drawn on a grid, obeying number constraints. Deceptively deep — Nikoli publishes entire books of them.
Kakuro
Crossword-style number grids where sums replace clues. Rewarding for people who love the intersection of words and math.
Where Puzzle Theory fits
Our aim is to add to this tradition — not to replace it. See our full list of games, and read our take on the best daily puzzle games if you want something to play right now.
Frequently asked questions
Where can I play these puzzles?
All puzzles mentioned by Puzzle Theory are free to play at puzzletheory.fun — no signup required. Try today's daily challenge to get started.
Do I need an account to play?
No. You can play the daily challenge and unlimited practice mode without an account. An account lets you save streaks and appear on the leaderboard.
Are Puzzle Theory games free?
Yes. Every game has a free daily challenge and free practice mode. Pro membership unlocks extra languages, difficulty tiers and replay of the last 30 days of daily puzzles.
How often do new daily puzzles drop?
Every day at UTC midnight. Everyone in the world plays the same puzzle each day, so you can compare with friends.
Can I play past daily challenges?
Yes — Puzzle Theory Pro members can replay any daily challenge from the last 30 days using the in-game date picker.
Play a puzzle
Put the ideas from this article into practice with today's daily challenge — or browse all our games.