Might & Delight's puzzle-platformer Pidseemed to go under the radar, despite being a game worthy of attention. Here's hoping, then, that a fair amount of free downloadable content can give the title a nice boost. On PC and Mac (Steam), Pid has been updated with 72 levels.
Specifically, these are challenge rooms, and something tells me they will live up to the name. All of the tools earned in Pid's main story mode will be accessible here, meaning if you can use it, you'll probably have to at some point.