Frequently Asked Questions

When I select "Play Now", the game does not appear or I get an empty grid/page?

Most likely the problem is with the Flash Player plugin for your browser. Try reinstall the player from Another way to check if Flash is the problem is to try another browser (each browser has it's own Flash player) or to play the non-Flash version if available (see next question).

If the game is not Flash based, it may be that the javascript code has changed and not picked up by the browser. If a page does not display properly, the first thing you should always do is refresh the page (circular arrow on side of address input field) or press the F5 key. This will make sure the browser goes back to the website to fetch the latest page and not use the old one in it's memory.

Which games use Flash and which use only HTML5?

The Flash based games are all invoked from a button with this background color. All the rest are HTML5 based and invoked from buttons of this background and foreground color.
Many games have been rewritten in HTML5 and you can select these instead of the Flash versions on their respective main pages. Those that are available for tablets and smartphones are all written in HTML5 (Flash does not work on mobile devices).
Please note that Adobe is discontinuing Flash at the end of 2020 and browsers will no longer allow the Flash player plugin.

My preferences and saved games are not being remembered.

Note: this only applies to Flash games.
Preferences and game state are stored via the Local Storage option that the Flash Player uses. It may be set to never allow storage or some other program has stored more than your limit set. Please see this Adobe help document.

If the problem has only started occuring recently and you are using the Firefox browser, it is because latest versions of Firefox have changed Flash security. If you wish to re-enable local storage, the following steps should work:

  1. In the address bar, type about:config and press Enter. A warning page may appear. Click I accept the risk! to continue to the about:config page.
  2. Find the preference dom.ipc.plugins.sandbox-level.flash and double-click on it.
  3. Enter the number 0 (zero) and click OK.
  4. Quit and reopen Firefox so that the change will take effect.

Why do the games not all work on tablets?

The reason is that most games were originally written in Flash which is not supported on iOS and Android. Games are slowly being rewritten in HTML5 and new games will be written in HTML5 to work on tablets. When you go to the home page of on a tablet or phone, you will be presented with a list of those games that work for that device.

Why can't I connect in the multi-user games? All other games work fine.

The multi-user games use a different server called a "socket server" and not a standard web server. This type of server makes a persistent connection instead of a new connection every time a request is made to the server and so it allows instantaneous responses and communication between multiple users. It allows the server and other users to send messages to your browser (like a chat application).
If there is a special security setup that blocks certain ports, you may not be able to connect reliably. The DKM multi-user server listens on port 3100.

I am getting intrusive ads popping up that is interfering with the game play?

If you are experiencing intrusive ads on this site, for example popup ads, ads obscuring game play or strange commercial links embedded in the page, most likely your PC is infected with "adware", a type of malware program that inserts it's content in web pages.
We do display ads on the site but only those from Google, using their Adsense program employed by well over two million other publishers. These ads are displayed to the side, like on this page and sometimes after the content. On any game play pages, they are always at least 150 pixels away (a Google requirement). There are never any popup ads and never any that you are forced to watch or read before being able to play.
If this is not your experience, please check for "Adware". One identified by some users is "" - do a Google search for more information.

How do I change my email or password or delete my account?

Login first and then click on your user name shown at the top right of the page.
Note: You cannot change your user name but there is an option on this page to delete your account.

When I select "Play in New Window", no window appears.

It may well be a pop-up blocker in the browser. This should not happen as the new window is from the same site, but there is a browser that does this. Also check that the new window is not under the main browser window.

My cursor is lagging and very slow.

This is a Flash anomaly on certain versions. For Sudoku, one solution is to uncheck the "Show Pen/Pencil Cursor" in Menu->Edit->Preferences.