Dynomite can be aquired at the store in the western town of Chapter 5. With the TNT, you can blow holes in the rockface at the western side of the map. You can always return to the store for more free-TNT if you need it.
In a few of the caves that you blow into you can find Gold Nuggets. You can then give these Gold Nuggets to the man at the store.
Sometimes you'll find what you think to be a Gold Bugget, when really it's just a Chicken Nugget, which does nothing when eaten. It's just a gag.
This chapter is the first one in which you will find a Big Heart. Of course, you'll find more of these throughout the game. They add an extra heart container in your life-bar, and then refills your life.
The Big Star is a Magic Item. It can be used to make you invincible for a short amount of time.
Chapter 5 Weapons
The Bola returns! But this time it cannot be thrown the full length of the screen.
Super Psychic Shockwave
Once again you'll meet up with Merlin, and he will increase the strength of your Psychic Shockwave, making it a Super Psychic Shockwave. This new weapon can only be used if you have enough life. It is stronger, and goes further than the Psychic Shockwave.