When user opens new puzzle all data connected with old puzzle must be GC'ed. Currently channel and all async stuff still alive because it listens to "clear" button thus it's not eligible for GC.

We have css for 3 sizes: small, medium and large. The only thing left to do is to implement "switcher" between 3 of them.

Currently state is saved on each change. It's ok with local storage but if we are going to implement remote storage (save on server via ajax) than it may be too heavy to send request with whole state on every change. One way is to implement timer that will save state every 5 (10) seconds.

It would be nice if we had indicator showing that there is some ajax requests in progress so user has feeling that something is going on and app not stuck.

Having authentication we can store progress on server.

If user has in-memory AND on-server progress we should carefully merge them together.

If user comes to main page, like http://nonojure.com/ (without sub pages) redirect him to last visited page. Example:

1. I came first time to the site http://nonojure.com
2. Puzzle browser is shown.
3. I choose puzzle with id aaabbbccc42
4. Puzzle shown with url http://nonojure.com/puzzle/aaabbbccc42
5. Solved half of the puzzle and closed page.
6. Opened page http://nonojure.com
   Here I should be redirected to last visited page http://nonojure.com/puzzle/aaabbbccc42. If user opened not main page but with specific url then no redirect is needed.

Last visited page can be stored in browser local storage, no need to keep it on server I think.

1. Remove unused font from index.html
2. In some browsers fonts are not loaded or loaded with warnings.

It would be nice if we had more styles.
Filled style can be

• image of the blot (current version)
• just black square

Crossed:

• image of a cross (current version)
• image of a black dot in the center of cell

Currently url is just http://host/ for both browser and puzzle. It must change depending on current view. E.g.:

http://host/puzzle/123456 - puzzle with id 123456
http://host/browser?filter=size&value=1-10 - browser showing only puzzles with sizes 1-10.

Currently ring-session cookies are has session scope, it means if you restart browser cookies are deleted. We need to set longer timeout so user doesn't need to login every time it enters the website.

After pressing mouse middle button game stops responding.

Currently mongo db's ids are used: 52488bff44aed7d0183a2922
It's better to use consecutive numbers. Random string as id looks a bit weird.

Extract ui related logic to separate namespace and create protocol for this. This way UI stuff has clearer API and we can potentially implement other widgets, e.g. using canvas instead of tables in future.