Bookmarklets are snippets of code in an internet bookmark which can affect the webpage you are viewing. This can add functionality to a page, or make some tasks easier.
Greasemonkey is a Firefox add-on to allow you to add scripts which change the functionality of websites. Go to my separate Greasemonkey scripts page.
As part of the FUBAR Labs March Madness challenge (Dead link!), I wrote this Minesweeper game in less than a day. There's no timer or flags, but otherwise it's just like Minesweeper.
The popular game of Connect 4. You have to try and get a line of 4 yellow counters before the computer gets a line of red counters.
Noughts And Crosses
The kids' pencil and paper game Noughts And Crosses, also known as tic-tac-toe. You must know how to play this - you have to get a row of 'O's.
The frustrating Button Madness. Clicking a square swaps the colour of that square and the ones to either side and above and below. You have to try and turn all the squares green. There is a key to winning!