Minecraft is a multiplayer block-based sandbox game. It's built in Java, so no installation is required (except for Java). Reddit already has their own server; why don't we? [more inside]
posted by archagon on Jun 9, 2009 - 28 comments

Two slimes. One circle. Infinite addiction. Welcome to the world of Slimeball. [more inside]
posted by Rhaomi on Aug 8, 2008 - 16 comments

Reset Generation : made by the makers of Trials 2, it's a web and mobile game that mixes advance wars and puzzle games. Rescue the Princess! Fire your Cannon! Beat your enemies! [more inside]
posted by darkripper on Aug 8, 2008 - 5 comments

Friday Flash Java Fun - 'Building Houses With Side Views' Entertaining Java game/exercise/doodad. [more inside]
posted by le morte de bea arthur on Jun 13, 2008 - 31 comments

Tetrod is a jigsaw puzzle and a four-sided domino game mixed together. -- Java puzzle game; choose 3x4, 4x4, 5x4, or 5x5.
posted by Gator on Feb 24, 2006 - 9 comments

Flea Circus! It's just like Lemmings! Only tinier! And faster! And you can only make three moves: Block, ramp, and other ramp! (java)
posted by Gator on Feb 17, 2006 - 11 comments

The Flowering Nose in Slugland adventure game. As a goblin with a flower for a nose, your ultimate goal is to find the lost sprout. Defeat enemies by throwing flowers at them; power up with hearts; teleport from level to level with such esoteric trinkets as donuts and cherries. (Java.)
posted by Gator on Jan 27, 2006 - 15 comments

Friday Java Fun - Junk's Hanoi, a cool puzzle for this lovely Festivus.
posted by knave on Dec 23, 2005 - 19 comments

Game-Oldies.com features a boatload (approximately) of classic games, playable in Java. Lemmings! Duke Nukem! Toejam and Earl! Trampoline Terror! (What?)
posted by Gator on Nov 11, 2005 - 30 comments

Phutball (Rules, Java Applet), aka Philosophers' Football or ConwayGo is a deceptively simple 2-player game you can play on a Go board, or any rectangular grid. (It may be simple, but finding the right move is [PDF] NP Complete.)
posted by Wolfdog on Aug 2, 2005 - 7 comments

The first rule of Internet Scrabble Club is that you make a predictable Fight Club reference in any posts pertaining to it.
posted by armoured-ant on Feb 17, 2005 - 66 comments

Fiendish bouncing snake game. Requires Java and lots of spare time.
posted by Spoon on Apr 2, 2003 - 6 comments

this childs game (java applet) is so complex you could use it to construct a computer. the original paper (postscript), is heavy going - if you're not a compter science student but would like to understand more try this wonderful book by one of the authors (example pictures).
posted by andrew cooke on Oct 7, 2002 - 7 comments

Jumping Jesus on a Pogo Stick! A little program that's fun for about five minutes. Play it with your mouse, and make sure you turn the sound on for the full effect.
posted by Yelling At Nothing on Mar 29, 2002 - 5 comments

Java Script Games.. Rush hours is far too fiendish and time killing for its own good.
posted by Mossy on Mar 1, 2002 - 6 comments

Jigzone - Another great place to waste time at work. The page features a java applet that lets you put together different jigsaw puzzles. I just started working tech support this week and the first day the person that was training me told me about this site. So far it has saved my sanity many a time.
posted by bytecode on Aug 30, 2001 - 7 comments