These puzzles are part cryptic-crossword, and part sliding-tile puzzle.
The solver is presented with a grid of letter-tiles, and some Across and Down clues for a crossword. These may or may not be numbered, and may or may not include the lengths of the answers. However they will in general be in the correct (conventional) order. The grid of tiles will have one (or possibly more) blank spot (which may be hard to notice when it is at an edge or especially corner of the grid). The puzzle is solved by 'sliding' the tiles - each move consists of sliding a tile into the blank spot from an adjacent spot, leaving it blank. I will also be providing an easier setting in which any tile can be moved (teleported rather than slid, perhaps) to the blank spot. This will be better if you like working out the crossword part of the puzzle but find the sliding-tiles puzzle tedious.
Although the tile-sliding is extra work compared to a normal cryptic crossword, on the other hand solving the clues is made easier by the fact that you know what the total set of letters in the solution is. A good strategy (in the larger puzzles) is to try to solve 'outer' words first, such as the first and last across clues. As well as helping you visualise and see what letters are left to work with, putting the tiles in place for such 'outer' words is the right first step toward putting all the tiles in order.
Use the mouse to click on the tile you wish to move to the blank spot, or use the arrow keys to move the blank spot. This may be counter-intuitive at first (the direction the blank spot moves is the opposite to the direction that the actual tile moves), but is more natural when you are used to the game. This is because the blank spot represents the focus of your influence on the grid, and hence carries some sense of your phyical location in the game. It also provides better continuity to think in terms of moving the blank spot than moving the tile since you will usually be moving a different tile every turn.
When I provide different options, there'll be buttons for them.
To quit, just Backspace out.
To start again, just refresh the page (usually F5 in Internet Explorer).
When I'm flooded with flattering fan-mail, I'll get inspired to write some more.
For the composition of solution and clues, nothing beats a pencil and paper (and dictionary perhaps). For the html playable version you can either
(a) copy my JS & html source-code, and modify the html to accomodate your own puzzle.
(b) e-mail me and get me to explain it (when I get around to replying).