Everyone gets the same puzzle, and it changes once a day at midnight UTC. The week has a shape: Monday and Tuesday are Easy, the middle of the week steps up to Medium, Friday and Saturday are Hard, and Sunday is Expert — so the challenge builds as the week goes, then resets. Finishing a day's puzzle keeps your streak alive; finishing without a single reveal earns a flawless mark. If you'd rather pick your own difficulty and play as many as you want, the free-play tiers are always there too. Prefer a different kind of daily challenge? Number Forge mixes six numbers and a target into a puzzle of its own, also fresh every day.