Human players can join your game at any time, replacing the computer players. To join a game in progress, select a game from the Select a game list, then press the Join game button. This is a standard four-player hearts card game . The game is over when any player has 100 or more points. The Hearts server may not be running or you may be behind a firewall.
Many companies have a firewall between their internal network and the Internet.
In order to play the game, the applet must open a network connection to the Hearts server, but the firewall blocks the connection. I don't see some of the playing cards. For example, I don't see any cards from a specific suit. Your web browser saves the card images in a cache on your local disk so that the next time you visit this page, it doesn't have to download the images again. Your web browser's cache may have been corrupted.