Free online logic games
Six browser puzzles to explore: code-breaking, Sudoku, nonograms and more.
Articles, guides and chronicles from El Código del Día
Strategy, history and reports from our logic competitions.
This collection explains the game from the beginning and explores the deduction behind every attempt. You can start with the rules, practise a step-by-step strategy or compare the colour challenge with other daily games. All content is free and requires no account.
Guides and strategy
How to play the code-breaking game
Rules, feedback and a worked example to help you start with confidence.
Strategy for winning in fewer attempts
How to design guesses that eliminate many combinations.
History of deduction games
From pencil and paper to daily browser challenges.
Daily logic games
What to look for in a good daily challenge and why a colour puzzle is worth trying.
🏆 Reports and competitions
Stories from our championships: protagonists, decisive matches and final standings.
Report on the first League · 2 November 2026
Singapur wins the title! The first League has a champion
Twelve contenders, seven rounds, a three-way tie for the podium and an unbeaten champion. Relive the title race.
Where to start
If this is your first game, read how to interpret the green and yellow counters. Once you know the rules, the strategy guide shows how to compare attempts and handle repeated colours. The selection of daily logic games explains the differences between playing once a day, practising in Infinite mode and sharing a challenge.
After learning the rules, you can play today's challenge, view the global ranking or compete with friends in private groups.