Inspiration Dave is a timed Flash platformer set in a semi-realistic world (sans floating boxes, spikes, etc...), where you control Dave, on a mission to collect notes in levels in the fastest time possible, while staying alive. Allegedly this is done to gain inspiration to overthrow a band, or something. There are 33 stages in total - some of these are secret. There are also rewards for doing very well in the stages, in the form of really odd unlockables!
A cave stage from Inspiration Dave.