Oft-featured developer Droqen has begun pre-orders for Probability 0, his first commercial release. The current pre-release price of $9.00 also includes three previously unreleased smaller games.

Droqen/Alexander Martin knows platformers: Fishbane, Nina, Have Faith, and Don't Lose Your Head are but a few of his games featured here, along with the freeware version of Probability 0.

Given the previous freeware version, I asked what people were paying for. Martin says that the freeware version had eight enemies, sixteen abilities, very little polish, and a lot of bugs. "The new version has I think twenty-three [enemies and abilities each], way more polish, and hopefully zero bugs!"

The HUD's been redesigned to be more helpful, too. Probability 0 will have three game modes: beginner, expert, and a weird mode "that you can only play every so often, unreliably. In it you get a bunch of points to spend instantly on trying new abilities you might not normally reach."

Probability 0 and Friends will release October 1 for Windows and Mac, along with a new demo of the main game.