Daily Stack is a free supplement puzzle — one puzzle every day, the same for everyone. You get six guesses to crack the day's stack. After each guess the tiles show you how close you are, so every guess teaches you something for the next one.
Finish the puzzle and you can share your score, and coming back daily builds a streak. A seven-day streak unlocks 10% off in the shop. A new puzzle arrives at midnight UK time — no account, no sign-up, just the game.