Click in the game to make sure it has the focus, then use the arrow keys to move the man around. If you ever owned a BBC micro you will know the rules, otherwise you have the fun of working them out. Hint: collect all the diamonds. If you get stuck, press Escape to restart the level, or reload the page to start again from the first level. The levels are all possible, but they get increasingly difficult towards the end. Have fun!
Nifki is a wiki that allows you to write games like this. You can edit the source code and the instructions over the web, then click on a button to get a version of your game that you can embed in any web page. This game is about 500 lines long.
"We" are mainly Alistair Turnbull and Tom Lynn.