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The daily challenge
The daily challenge provides one puzzle per level for the current day. Everyone on the same level gets the same daily puzzle, regardless of language. You can compare approaches afterwards without relying on a random draw.
Play immediately as a guest. A name is only needed to save scores.
How it works
Choose a level and enter your answer. The day changes at midnight in the Europe/Amsterdam time zone. Switching language does not create a second score. Across the three levels, your best daily result counts; an improvement adds only the difference.
Worked example
You earn 40 XP on easy today. Then you solve the medium version, worth 60 XP. You gain 20 more XP, not another 60. Your daily result becomes 60. You can keep challenging yourself without repeatedly earning the same daily score.
A useful approach
Try without a hint first and note which information you lack. Then check whether the hint supports your approach. Questions come from a finite collection, so a puzzle can return later. New content may change the schedule. A daily puzzle does not promise a never-before-seen question every day.