Fair warning: this isn't the other Dragon Quest. You know, the one with the slimes. They're totally different things. This Dragon Quest is a physics puzzle platformer by Meetreen Games that stars a crimson-haired knight out to rescue his friend from a nasty kidnapping dragon. It's probably planning on doing terrible dragon things to her, like forcing her to clean bits of previous crimson-haired knights out from between its fangs, so you need to get over to the dragon's lair and rescue her!
Use the [arrow] keys to move and the [spacebar] to jump. Swing your sword with the [control] key. Your sword is used more for solving puzzles than actual combat; the most common enemy, skeletons, are only stunned by sword slashes. Instead you'll need to use physics to destroy them. Dropping a huge weight on them usually works, as does shoving them into one of the castle's ubiquitous fire pits. In every floor you'll need to solve a puzzle to make a door key appear, grab it, then exit through the door. Most of the puzzles involve finding creative ways to dispatch enemies; a favorite has you dumping a skeleton into a fire pit by way of a wall of barrels, Donkey Kong-style! You also get to mess with a variety of physics-based props like ballistae and drawbridges. Finally, every few floors you'll reach a boss floor which will give you a chance to battle the dragon man-to-lizard.
Dragon Quest is one of the easier physics games we've featured on the site and it won't take you long to make your way through it. There's enough charm in the puzzles to make it worth a look, though. Just be careful... they say dragons have pretty terrible breath. Must be all those knights they eat...