In 2009 I gathered a team of co-workers from Isotop to enter a competition where you were supposed to build a game with a final result of less than 4 kilobytes.
Since I’m both interested in game development, optimization and low level actionscript this competition seemed even more compelling to me.

The game is released over at Wonderfl (http://wonderfl.net/c/7uqT), although it’s so optimized that it’s more or less impossible to understand anything =)

Setting the prerequisite
The first thing we started with was going through what would be the easiest thing to do for making the game fit into 4k from a technical perspective. Then we did the exact opposite (its supposed to be a challenge) =D
This meant that we wanted:

• Bitmap graphics, not vectors
• A 2D platformer with a huge world you can explore
• Sound!

To achieve this we had to create our own image format (it even supports palette swapping) and generate all sounds at runtime.
We had a great time hacking actionscript at this low level, and the game turned out pretty impressive (although its more technically impressive than it’s fun to play ).
The game ended 4:th place in the competition.