dosudoku.com uses a unique interactive play window, with a wide range of capabilities including: Works in any modern browser without requiring any plugins (including Internet Explorer, Firefox and Safari) Unique digit and grid resizing code - try it and see! Unlimited full undo and redo - makes solving much less stressful, and means finger trouble doesn't ruin the game! Fast entry by pushing number keys to enter big/small numbers; press again to toggle Push 0, backspace or delete to clear a grid entry Hit SPACE to toggle small/big entry, or click on the relevant option Double-clicking on a single small number will make it big (this is very handy with the auto-remove feature) Auto-add small numbers Auto-prune small numbers Check your solution (and point out empty cells too) Show invalid moves Show incorrect moves (also glows numbers in IE) Customisable so can change colours etc easily if need be Generated from PHP using MySQL database backend, but can be redeployed using an alternate server system Arrow keys and TAB/SHIFT-TAB to move around Or click to move around Click on the entry cursor to remove it for aesthetic purposes Reveal solution - and also highlights the entries you had wrong (try it - it uses small green numbers) 'Please wait' message whilst loading And more! If you wish to license the player module for use on your website or other outlet then please contact Gareth Moore at dosudoku.com.