You are currently using the Java 1.4.2 version of the Mario Platformer.
Please note this requires the latest Java Runtime Environment, which can be found on java.sun.com. If you do not wish to download this, please use the Java 1.1 Windows Virtual Machine version of the game. This can be found Here
Change Log:
10/05/2003: Game optimized in the string department. People experiencing slowdown/memory loss should not encounter this as frequently. Secondly, collision detection is now more lenient. It is much easier to kill the enemies.