A few flash or java games I enjoy playing, maybe you will as well. But be warned, they can be addicting. Try not to waste too much of your life on them.

Dicewars A strategy game where you try to take over the map with dice. Your opponents are computer controlled.

Falling Sand Game Simple, yet insanely addictive. Manipulate the elements of sand, water, salt and oil. You have a variety of tools at your disposal; including walls, plant, cera (wax), and fire.

flOw Eat stuff to grow and work your way down to the lower levels. But watch out! Some things are not easy prey.

Hell of Sand Same as the Falling Sand Game, except you can have zombies. Also, mixing water and salt will produce salt water. Woo!

Murloc RPG: Stranglethorn Fever Play as a Murloc from World of Warcraft in this flash RPG. Stranglethorn Fever is the expansion of the original flash game. Many more areas, enemies, and items added.

Pyro Sand 2 Also very similar to the Falling Sand Game, but you have a few more explosive options in your toolbox this time. Play with C-4, nitro, gun powder, among others.

Stick RPG Complete (external link) Face the challenge of struggling to survive in a 2D Grand Theft Auto-like world. Get a corporate job, participate in bar-room fights, buy houses and drugs. Steal a car, or run for president. Keep in mind, each decision you make affects, or is affected by, your Karma.