Find these videos, and more, here: www.possibilityspace.org/pixie/

And find the paper, again, here: ojs.aaai.org/index.php/AI...

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We can do more nuanced things too! For this, I set up Pixie's goal so it was to make the player move around a lot, but not make the game much harder in the process. It created this spawned of very slow-moving obstacles, so they're easy to dodge but make you run around a lot more.

This can result in quite... unusual suggestions. Part of the fun with working with Pixie was seeing this kind of thing. All the examples in the paper are run on games I didn't write, so it's all new codebases Pixie wasn't designed for!

So for example, here's an implementation of Breakout. We'd like to make a powerup to make it easier for the player to win. After a while, Pixie came up with this - the ball gets bigger on each bounce. Watch what happens... a very broken idea, but one that's kind of fun and unexpected.