Blooper: White squid-like creatures that chases you around the water

 Bowser: King of the Koopas. Boss of each world. Breathes fire and throws hammers sometimes.

 Bullet Bill: Bullet shot from a cannon at Mario

 Buzzy Beetle: Invulnerable to fire. Turns to a shell when killed.

 Cheep Cheep: Fish that either swims around water or leaps out of water at you

 Fire Rod: A ring of small fireballs rotating around a block. Usually in dungeons

 Goomba: Regular walking brown guy. A basic enemy.

 Green Koopa Paratroopa: Hopping Koopa troopa with wings

 Green Koopa Troopa: Regular turtle, with MANY colored and super-sized cousins. Turns to shell when jumped on.

 Green Piranha Plant: regular, spiky mouthed plant that usually comes from pipes

 Hammer Bros.: Giant, standing turtles that throw hammers

 Podoboo: A fireball that shoots from the lava in dungeons

 Red Koopa Paratroopa: Floating Koopa troopa with wings

 Red Koopa Troopa: A turtle that walks back and forth.

 Lakitu: A floating Koopa in a cloud that throws spiny's or spiny shells.

 Spiny: small koopa troopa with spikes on it's back

 Spiny egg: thrown by Lakitu. Turn to spinies when they hit the ground