http://distractionware.com/games/flash/hexagon/

Super Hexagon is better in my opinion but its also not free so.

Oh gosh this is hard.

Quote from AlphaMan

Oh gosh this is hard.

Super Hexagon has 6 harder difficulties
Hyper Hexagonest is Hardestestest


Just because you see it doesn't mean you can do it

Wow, this is awesome and addictive! (my eyes a bit hurts XD)
Nice choice of musics as well, and they're vary.
Has anyone reached level 3?

I beat the first difficulty on super hexagon
it goes: point, line, triangle, square, pentagon, hexagon
the flash version is not as responsive so i've gotten to square

Oh boy. I'm having a seizure.

i had no idea what to do for about 2 minutes till something inside me said "RANDOM BUTTON PRESS TIME!" :D

This game makes my head hurt.

Quote from Molgera

This game makes my head hurt.

I believe Super Hexagon will be the HARDESTESTEST one. This is still the regular Hexagon, and I finished with max. time 77.49 secs (of course with multiple times 'try and dead' strategy) lol. .__.

For those who want to hear past the first 3 seconds:
http://chipzelmusic.bandcamp.com/album/super-hexagon-ep