Foot soldiers of the Turtle Empire. Stomping on Koopa Troopas make them recede into their shells, which can be kicked to hit defeat enemies. Like Little Goombas, green-shelled Koopa Troopas walk off ledges.
Carnivorous plants that sit in pipes. Piranha plants emerge and retract from pipes in set internals. If Mario stands directly next to or on these pipes, the plants do not emerge.
A poisonous item that reduces a Super or Fire Mario/Luigi back to their standard form. If Mario or Luigi are already in their standard form, they lose a life.
Foot soldiers of the Turtle Empire. Stomping on Koopa Troopas make them recede into their shells, which can be kicked to hit defeat enemies. Like Little Goombas, green-shelled Koopa Troopas walk off ledges.
Carnivorous plants that sit in pipes. Piranha plants emerge and retract from pipes in set internals. If Mario stands directly next to or on these pipes, the plants do not emerge.
The basic enemies of the game, Shyguys walk back and forth, harming the player if they run into them. They can be picked up and thrown. Red Shyguys walk off cliffs while pink Shyguys turn at the ledges.
Snifits shoot projectiles at players, but they act similar to Shyguys. Gray/green Snifits jump and fire projectiles while the other variants walk. The pink Snifit turns around at ledges while a singular red Snifit in World 3-3 walks off ledges.
Hoopsters crawl slowly on vines or trees aimlessly, occasionally speeding up whenever descending. They harm players if they make contact with them from above or the side. Players can jump on and ride them like an elevator, and even pick them up and throw them.
Phantos are normally dormant enemies, but if players pick up a key, they attempt to fly into the player. If the player drops or uses the key, they deactivate. They cannot be picked up and there are limited methods to destroy them.
Trouters jump from below and fall back. Players can use them as platforms to jump across gaps, but Trouters can harm players if players touch them at the sides.
Bob-Ombs run back and forth and eventually self-destruct if they are near a player. If they self-destruct, they can harm players. Players can pick them up and throw them.
Albatosses fly only horizontally. They can drop Bob-Ombs on players, but they can also be ridden. Unlike other enemies, they cannot be picked up, but they are defeated as with any other enemy.
Pidgits are always seen on carpets. Pidgits attempt to dive bomb into the player, but players can jump on them, pick them up, and throw them. Once the Pidgit has been removed, players can ride the carpet and control it for a brief amount of time.
Cobrats are seen roaming on the ground, but they can also hide in jars. If they spot a player, they may jump and shoot a single projectile. Cobrats can be picked up and thrown.
Pansers shoot fireballs at the player. Red varieties are stationary and shoot three fireballs. The green/gray variety patrols and shoot fireballs straight up. Pink varieties chase the player and shoot three fireballs.
Ostros are often seen being ridden by Shyguys. If the Shyguy is removed, they travel in a straight line. They can be picked up and thrown, but they do not bounce off enemies.
Pokeys attack players by moving slowly into them. Pokeys can be various heights. They can be defeated by having objects thrown at them or their body segments being removed one by one.
Shyguys often ride Autobombs. Autobombs shoot projectiles, but if the Shyguy is removed, they simply move. Players can ride on Autobombs, but Autobombs must be destroyed with an item.
Defeatable enemies yield different points depending on the means of attack. Striking an enemy with the cape or knocking into one while it is standing on a block yields 100 points. Stomping or striking one with a shell yields 200.
A round, chestnut-like creature. After stomping a Goomba, Mario or Luigi can carry it for a short distance and throw it. Some Goombas come floating in bubbles.
A carnivorous plant that jumps out of a pipe. It cannot be stomped on, but it can be bounced off with a Spin Jump. In Fall, all Piranha Plant variants wear Jack-o'-lanterns on their heads. These ones are called Jumping Pumpkin Plants.
A carnivorous plant that lives in a pipe. It cannot be stomped on, but it can be bounced off with a Spin Jump. It can be defeated with fireballs, capes, or Yoshi.
A turtle dressed in football gear who charges at Mario or Luigi. Most Chargin' Chucks are Lookout Chucks that charge directly at Mario or Luigi once they appear onscreen, and can jump up vertical walls. Others have unique means of attack, but revert to Lookout Chucks when stomped. The uniquely-behaving Chucks are: Clappin' Chucks that jump straight up and clap when approached; Splittin' Chucks that split into three; Passin' Chucks that have endless supplies of gridiron footballs to kick; Confused Chucks that throw baseballs; Diggin' Chucks that dig up rocks with a shovel to throw at Mario or Luigi; ones that jump high into the air; and ones that whistle to summon other enemies like Rip Van Fish and Super Koopas.
A mobile cactus with a spiked head. If Mario or Luigi is riding Yoshi, a Pokey will have five sections instead of three. It cannot be stomped on, but it can be bounced off with a Spin Jump.
A blue dinosaur that takes two stomps to defeat. After the first stomp, the Rex is squished to half its size and becomes faster. A second stomp flattens it completely and defeats it.
A turtle that paces steadily back and forth on a platform. When it reaches an edge, it turns around. In Fall, all Koopas wear Mario-themed masks and are referred to as Mask Koopas.
This is the slowest shell-less turtle. Unlike the other three shell-less Koopas, blue Koopas without Shells do not enter a shell. They slide on slopes and will kick a shell if they come in contact with one.
A turtle that rides in a cloud and throws Spiny Eggs down at Mario or Luigi. If Mario or Luigi hits him with a throwable object or spinning cape, he can ride in his cloud for a limited time. However, if a Lakitu is stomped on, the cloud disappears. In some courses, Lakitus occur in pipes.
This enemy tosses hammers from its swooping platform, attempting to attack Mario or Luigi. It can be defeated by hitting the bottom of the platform it sits on.
A single-spiked red turtle that climbs around walls and platforms. Just like Buzzy Beetles, Spike Tops are immune to fireballs. They cannot be stomped on, but they can be bounced off with a Spin Jump.
A shy ghost that stops moving when Mario or Luigi looks at it. It is impervious to fireballs and capes. It cannot be stomped on, but it can be bounced off with a Spin Jump. Some Boo Buddies appear as an invincible snake-like chain that bounce around the room. Others appear in large groups with members phasing transitioning from translucent and harmless, to opaque and damaging. Boo Buddies with a similar behavior appear in the Sunken Ghost Ship.
An invincible ball of lava found in castles. It cannot be stomped on, but it can be bounced off with a Spin Jump. The diagonal type is always in the air, bouncing off any walls it runs into in an attempt to hurt Mario or Luigi.
A Koopa Troopa skeleton. It falls apart when Mario or Luigi stomps on it, and after a short time, it reforms its body. It can also throw bones at Mario or Luigi. It is impervious to fireballs.
A large spiked ball on a chain that cannot be defeated. The chain is harmless; it swings behind Mario or Luigi. A Ball 'N' Chain cannot be stomped on, but it can be bounced off with a Spin Jump.
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