There you are, standing on the precipice. Your pixelated toes hang over the edge. Taking a deep breath you move forward — and fall, cursing the heavens and hoping that the louder you say "But I pressed jump!" will make a difference. Such is the fate of all characters at some point — they fall. Some games take the idea of making that perfect jump and dare you to try hard at every turn in order to make every single jump count, and every miss hurt.
Karoshi Factory (Windows, 8MB, free) - The Karoshi series has captured the minds of sadistic-minded frustrated gamers everywhere, with the objective being not to finish the game in good health, but to kill the protagonist in every single level. Karoshi Factory continues in this vein. For a different experience, check out the much shorter and more artsy Pazzon.
Jumper 3 (Windows, 8.5MB, free) - Another installment in a classic game series has also been recently released, with a new Jumper game making its debut not long ago. In this game, you are given five different characters with which to traverse the dangerous terrain. Switch between the variations based on their individual skills. While the levels are easier than the previous games, hats are included along with time trials and coin collecting to beef up replay time.
Happy Runner (Windows, 2MB, free) - It seems the effect of I Wanna Be The Guy's incredible difficulty is still being felt with games appearing every so often to challenge and frustrate with willing glee. This also incorporates a genre I love - the One Switch Game. In this painfully difficult platformer, one single button controls not only running and jumping, but also running while jumping.
Syobon Action (Windows, 3MB, free) - In this jolly Mario-styled game, you play the role of a delightfully happy cat in a delightfully happy land. Unfortunately, it is the "I Wanna Be..." in difficulty and absurdity. More linear in story, the humour comes not from dying often, but in various ways, such as huge chunks of the ground disappearing below you. "Learning by making mistakes" now has a poster child. Note: Page is in Japanese. Click the second link from the top to download.