Dicewars is a pretty old game, but I've never learned to play it and the website doesn't have any instruction.
On the umpteenth time it's suggested to Neatorama, I've finally played it for the first time ... and I'm hooked!
Here's how you should start playing it: select the 2 Players mode (you'll be purple). When it's your turn, click on a purple area, and then click a neighboring green area that has fewer dice. The computer will "roll" the dice for you and if yours come up higher, then the area attacked will turn purple. You can end your turn at any time, but it makes sense to attack until you can't win anymore.
If this is too easy, then you can move to the 3, 4, 5 players and so on mode.
Link [Flash] - Thanks (and darn you for introducing such an addictive game) Jerse!