Glazier's Dozen
Glazier's Dozen is a daily puzzle that plays in the browser on phones, tablets and computers, for one player. It has a daily challenge, the same for everyone that day.
Glazier's Dozen is a daily puzzle where you clear a stained-glass window in twelve swaps or fewer. Swap neighbouring panes to make lines of three of one colour; matched panes turn to clear glass, nothing refills, and a pane can slide into clear glass. Every window is built backward from clear glass and checked by a solver, which sets the par you play against, and an archive keeps the last 60 days.
How to play
- Swap two neighbouring panes to make a line of three of one colour
- Cleared panes turn to clear glass and nothing refills. Slide a pane into clear glass
- Clear the whole window within twelve swaps. Undo is free
The game shows these steps as you play, the first time.
Controls
- Swipe a pane onto a neighbour, or tap one then the other
- Keys: arrows move, Space picks, an arrow swaps
- U or Backspace undoes, R restarts
- ← → on the start card choose the day
Tips
- A colour left with one or two panes can never clear, so check counts before breaking up a group; Undo is free and unlimited.
- Clear glass is room to move: sliding a pane into an empty space costs a swap but can line up panes that were stuck apart.
- Par comes from the solver and is often below twelve, so look for a swap that finishes two lines at once to save moves.
Is every window in Glazier's Dozen solvable?
Yes. Each window is built backward from clear glass, one line and one swap at a time, and the build is replayed forward with the real rules to prove it clears in twelve swaps or fewer. A solver then looks for a shorter way, and par is the shortest found.
What happens if I use all twelve swaps?
The window ends as not clear, showing the panes left and the par. You can try the same window again at once, as often as you like, and your best count for each day is kept on your device. Undo and Restart never cost anything during a try.
About this game
Made by Sucia in Houston, Texas. Built with AI assistance, designed and tested by Sucia. Last updated October 9, 2026. It plays in the browser on phones, tablets and computers, with no download and no sign-in; your best scores and progress stay in this browser on this device. Without a pass, every game is free for 5 minutes a game and 30 minutes a day; an Arcade pass removes the limit. How Sucia makes and tests its games.
Also by Sucia
Sucia Studio, a video editor for streamers, runs on Windows and Linux: record, cut long VODs by transcript and make Shorts. YouEdit, a video editing service for stream recordings, turns a recording into a YouTube video, Shorts, titles and the upload text, quoted in credits before it is made. Streaming on Twitch, Kick or YouTube? Sucia Live makes highlight videos and Shorts from your VOD.
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