Particles! has undergone a fair number of changes since I last posted a link to it here. If you didn't get a chance to play it before give it a try (works pretty well on the iPad as well).

It's still very much in a "beta" stage but I think it's getting to a reasonably solid state. If you get stuck or are confused about how to play, there's a help menu -- just click/tap the "?" on the right side of the screen. It's verbose, but you should be able to find what you need without reading it all.

Feedback is super welcome!

Note: some logging data of your gameplay is recorded though no identifying info is saved. If you really don't want your data saved, enter in a silly age, like 999, and your record will be filtered out.