Avoid Fighting the Buzzard
On Mt. Rugged, when you encounter the Buzzard enemy, tell it that your name is Luigi, and you won’t have to fight it.
(Thanks to Nik)

Free unlimited hearts
While in Toad Town, head to the right from the post office. Eventually you will see 3 blue creatures. Walk in circles around the one with moving eyes to receive more hearts.
(Thanks to Jay-jay)

Level up and Easy Experience Points
In the Flower fields, take the bottom right-hand path and cross the spikes with Lakilister. A glowing Amayzee Dayzee will randomly appear with 1/4 odds. Use a dizzy spin attack to daze it before the battle starts, then kill it in two turns for massive star points. Travel two screens away and return to repeat the battle.
(Thanks to ACE)

Luigi’s Secret Basement
First, get the Super Boots. Then, go to Mario’s house via Toad Town and stomp the ground inside Mario and Luigi’s bedroom. Eventually, you’ll see a tile on the floor going up when you stomp. Stomp on that tile and the floor will bust open Luigi’s secret basement, and inside is his own secret diary.
(Thanks to RedCow)

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