Click on various places on the stage to hear a sound and see an effect! Or try clicking and dragging the mouse. Remix and change the sprite or the backdrop, adjust instrument or the sounds, or try applying a different effect on the clones.
Credits to @Scratchteam and @Rcb55ski! I also think the SpongeBob character sprites were made by @SquidwardTentacools but I can’t remember for sure.