Heavy Zeds are a species of owls that assist Mario during his journey in the Tree Zone in Super Mario Land 2: 6 Golden Coins. Heavy Zeds are generally found asleep, but if Mario approaches one, it wakes up. A Heavy Zed has a flat head that Mario can stand on to have it carry him to another location.
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| Characters | Protagonists | Mario • Heavy Zed • Hippo |
| Antagonists | Wario | |
| Bosses | Bosses | Big Bird • Sewer Rat • Tatanga • Three Little Pigheads • Pako & Poko • Witch |
| Worlds and levels | Tree Zone | Invincibility! • In the Trees • The Exit • Honeybees • Final Boss: The Big Bird • Secret Course 1 |
| Space Zone | Moon stage • Star stage • Secret Course 2 | |
| Macro Zone | The Ant Monsters • In the Syrup Sea • Fiery Mario–Special Agent • Final Boss: One Mighty Mouse! • Secret Course 3 | |
| Pumpkin Zone | Bat Course • Pumpkin Zone Level 2 • Pumpkin Zone Level 3 • Witch's Mansion Course • Secret Course 4 • Secret Course 5 | |
| Mario Zone | Fiery Blocks • Mario the Circus Star! • Beware: Jagged Spikes • Final Bosses: Three Mean Pigs! | |
| Turtle Zone | Cheep Cheep Course • Turtle Zone • Whale Course • Secret Course 6 | |
| Overworld | Mushroom Zone • Hippo • Scenic Course • Mario's Castle • Casino | |
| Enemies and obstacles | Enemies | Ant • Aqua Kuribō • Battle Beetle • Bear • Bee • Bee Fly • Bēro • Blurp • Bomubomu • Boo • Bopping Toady • Būichi • Bullet Bill • Cheep Cheep • Chikunto • Dokanto • Dondon • F Boy • Floating Face • Goomba • Goronto • Grubby • Honebōn • J-son • Jack-in-the-Box • Karakara • Keipu • Kiddokatto • Koopa Troopa • Kyororo • Kyotonbo • Kurokyura • Minikyura • Mōgyo • Neijī • No.48 • Noko Bombette • Para-Goomba • Pikku • Piranha Plant • Poro • Ragumo • Rerere • Shark • Skeleton Bee • Spikey • Spiny Cheep-Cheep • Stars • Tamara • Terekuribō • Toriuo • Tōsenbo • Unera • Unibō • Venus Fire Trap |
| Obstacles | Boulder • Cannonball • Crystal ball • Falling spike • Fire Pakkun Zō • Furizō • Genkottsu • Guruguri • Karamenbō • Lava • Spike Pillar • Tatenoko • Tōsanbōru • Turtle Cannon • Wakiri • Yashichi | |
| Items | Items | 1-Up Heart • 3-Up Heart • Carrot • Coin • Fire Flower • Golden Coin • Moneybag • Mushroom • Starman |
| Objects | Objects | ? Block • Beach Ball • Bone Lift • Bonus Bell • Brick • Cloud • Cog • Empty Block • Fiery block • Goal • Invisible/flashing block • Mid-Point Bell • Skull Platform • Soap bubble • Tree sap |
| Forms | Forms | Small Mario • Super Mario • Fire Mario • Bunny Mario • Space Mario • Aqua Mario • Invincible Mario • Bomb Mario |
| Miscellaneous | Locations | Mario Land |
| Other | Gallery • Amida Game II • Mario Catcher | |