WASD to move, click to fire. Bowser has got smart fire now, it follows the cursor. Z and X adjust the volume of the music. Beware: When Yoshi hits the ground, the tremors caused by his massive impact will kill you if you are touching the ground. Jump when he lands. Hit Yoshi with fireballs to hurt him.
For the Bowser sprite upgrade since last game, and the music, I thank GameHutSoftware for his project Bowser Sprite Pack. For the Yoshi sprites, I thank yoshi67057 for his project yoshi67057 sprite pack. For the gravity script used by Bowser, I thank ninjabou and his game cloud inc. Again, thanks for sharing the great sprites/scripts to all of my benefactors.