We released a free version of Zero Falls a while ago, it was this version.
There is a new version now, and it isn't this one anymore. The promotion has ended. Sorry about that. In fact, we kinda want to take down this link because the new version is so much better and this old version is kind of embarrassing to be perfectly frank. It crashes, it lacks content, it's just generally not that awesome anymore.
Eh, I guess there's nothing I can do about that.