Select the sample from the pull-down menu at the upper right,
and push Start button(At the first time, it takes a moment till the demo starts).
The barrage of bullets is shown in the upper left screen.
Move a mouse cursor on this screen, and avoid bullets.
To stop the demo, push Stop button.
If you want to describe your own BulletML document,
write BulletML document on the right area, and push Start button.
If your document includes errors, the error messages are shown in Console area.
Select the Horizontal/Vertical modes at the pull-down menu at the left.
Change the difficulty(the value of variable $rank) at the bar at the left.