After all these years, and growing up with Windows 3.1, I have seen an entire evolution of computers and software. Touch screens and large resolutions were a pipe dream just 15 years ago. Now it's the norm. Going from a Packard Bell (yes, before HP) that couldn't run 3D Ultra Mini...
Learn what the power-ups in multiplayer do and make sure you use them to your advantage.
When you're underwater, you can jump much, much higher.
Don't try and get all the hearts, for it's not worth losing a life to get three more.