This is a fun platformer where you have to clone yourself to complete levels. It's pretty hard but there's a link to the walkthrough in the game.
http://www.kongregate.com/games/GregAnims/use-boxmen
A physics game where you have to arrange objects to guide the ball into a bucket. Sort of like The Incredible Machine.
http://dynamic.systems.fizzlebot.com/
The new Gemcraft is out on armorgames. This one seems much harder than the first (which is a good thing IMO).
http://armorgames.com/play/3527/gemcraft-chapter-0
A fun little puzzle game on Kongregate. Use your sword to cut the chains and release the balls. Get the balls to the urn of the same color to complete the level.
Civiballs
Hex Empire
This is a great strategy game somewhat like Risk. You face three computer AI opponents, each with their own military and capitals. Your manpower grows as you capture towns. Ultimately, you have to capture all the enemy capitals.
The Space Game
A great realtime strategy game.You're playing the part of a heavily armed mining company battling for territory and resources. Establish your mining space station in the midst of the asteroids fields and extract their mineralistic goodness.
This game is from the same guys...
Super Stacker 2
A fun little physics puzzle game where your only goal is to stack shapes and keep them stable for a set amount of time. Pieces appear at your cursor in the order shown at the top of the screen. Gently place them and, when the last block is set, the clock starts ticking. Cross...
Viking Defense
A fun tower defense game on Miniclip. It follows the basic tower defense formula, but there are a few twists. The most interesting aspect is the idea that certain upgrades and new towers are unlocked only by reaching certain achievements. Worth checking out if you're a fan of...
Castle Clout
Time the launch of your trebuchets ammunition to cause maximum damage to the opposing castle and its occupants. The game is a bit flawed but still pretty fun.
Ice Breaker
A great-looking physics-based puzzle game involving vikings, chunks of ice, and vikings frozen inside chunks of ice. Using the mouse, simply draw lines to cut the ice and drop vikings onto the ship.