VVVVVV is a fun retro platformer which features gravity flipping instead of jumping, and some ridiculously hard rooms (the hardest ones are usually optional). It was part of the Humble Indie Bundle #3 earlier this year.
For a good while I've been trying to get the optional trinket in “Doing Things The Hard Way”, and apparently I got the hang of it at last. This is the first time I succeed in this little side-quest after something around 1000 attempts. Two (unexpectedly) failed attempts are also featured in this footage:
Sadly, for technical reasons I couldn’t record any sound, hence I decided to keep it unlisted in my account. The chiptune music and sound effects are, in my not-so-humble opinion, an essential aspect of the game and they may well be the only reason I accepted the challenge and completed all the main levels (back in August, granted, but there is replay value).