Man-eating plants! Skeletons! Giant spiders! Falling boulders! What do these things have in common? They're all very, very deadly. And they, along with a host of other unpleasantness hungry for your demise, are waiting for you in Spelunky, an incredibly addictive roguelike platformer from Derek Yu. Explore, descend, discover... just remember to watch your back and keep one hand on your whip!

Your journey as Arkus Rei, space pirate, continues in this series of extremely challenging platform adventures. Follow the instructions given by your new found human companion to uncover treasure beyond your imagination. But first you must travel to several different dangerous locales and, well, survive.

The first Flash game from Anna Anthropy, When Pigs Fly is an extra-challenging offbeat platformer about a pig who has to escape from a cavern using her newly-grown wings, which are unfortunately the most fragile creation in the history of the universe. Even negotiating a simple floating block takes some skill, and an innocent staircase becomes a jagged nightmare.

Cheerio, my good man, pip pip! The name is Sir Reginald MoneySeize II, Esq. I'm out to construct the world's largest tower, and I'll need 1000 golden coins to do it. Are you up to the platform-jumping challenge, my well-buttered scone? I sincerely hope so, for I'm simply too well bred and important to fall to my death on a bed of spikes.

When you load up Raider: Episode 1 in your browser you can expect solid controls, a good story, and magnificent level design that will put your platforming skills to the test. This first in a series of five episodes sets a high standard for the four episodes to follow.

Labyrinth is not your average dungeon crawl, but instead an online riddle, with more than a few twists and turns to set it apart, and a horde of fiendish puzzles that just may trap you for eternity. The focus lies in code breaking and logic, the community and support features are outstanding, and many puzzles have multiple solutions. Can you emerge from this place victorious, treasure in hand?

Gride is an arcade-style action game in which the objective is to apply and remove abilities to an always-moving little pink sedan at just the right moments to make it as far as you can along the never-ending terrain. It was good enough to take 3rd place in our 5th game design competition, and it earned the coveted Viral award by receiving more than one million views more than the next most played game!

An Untitled Story is a perfect blend of tough platforming challenges, intimidating boss fights, and cunning secrets, all wrapped up in a layer of childlike mysticism and rough-shorn beauty. It is a chilled-out hardcore wonderland of action discovery, plus an unidentifiable je ne sais quoi that just makes you want to drink it down in one gulp and then spit out a rainbow.

Why are so many of the most difficult video games also the cutest? Maybe my brain just automatically forgets games that are both ugly and frustrating. Added to the "cute but evil" list comes Within a Deep Forest, a completely free downloadable game for Windows that casts you as a little blue ball, bouncing around a delightfully whimsical little world filled with the most frustrating jumping puzzles known to man.

Do you yearn for a game to challenge your massive intellect? Did you beat My Diamond Baby in a half-hour without cheating? Want something harder? Well, here it is: God Tower. This is the toughest puzzle game I've ever seen. I'm not going to lie to you; it's currently unbeaten. But that shouldn't be a problem for you, right?

My Diamond Baby is another single-room point-and-click game, this one was created by Project C-Time! and Haruo Seto. You start off as someone on a motorcycle on his way to give an engagement ring to his girlfriend. On his way he is involved in a motorcycle accident. When he regains consciousness...

Created by Taro Ito, a Japanese game developer whom publishes his work under the name GameDesign, this domino-toppling game transported me back to Nan's living room floor where rows of dominoes and blocks often stood, precariously on end, awaiting destruction.

Created by Klas Kroon of Sweden, this little game is one of the tiniest Flash games I've ever seen. The objective of Blockdude is to move the little dude to the exit door by picking up and moving blocks to solve each level. This game is actually a remake of an old TI-83 game originally written by Brandon Sterner.