SUSoku: the daily murder logic puzzle
There has been a murder. You have a grid, one person per row and per column, and a card for each suspect carrying one true clue. The victim was alone with the murderer: once you work out where everyone stood, a single person will be left in her room. That is your culprit.
A murder, a grid, honest clues. Work out where everyone was, and who did it. A new challenge every day at midnight, the same for everyone, free and with no account. The app for iPhone, iPad and Android holds 735 cases across seven settings.