List of cheats (for reasons)

[DynamicGamern00b]

needashell - Reserve box holds a green shell.
needaredshell - Reserve box holds a red shell.
needablueshell - Reserve box holds a blue shell.
needayellowshell - Reserve box holds a yellow shell.
needaturnip - Reserve box holds a turnip.
needa1up - Reserve box holds a 1-UP.
needamushroom - Reserve box holds a Super Mushroom.
needaflower - Reserve box holds a Fire Flower.
needaleaf - Reserve box holds a Super Leaf.
needatanookisuit - Reserve box holds a Tanooki Suit.
needahammersuit - Reserve box holds a Hammer Suit.
needaniceflower - Reserve box holds an Ice Flower.
needanegg - Reserve box holds an egg with no contents.
needaplant - Reserve box holds Toothy, a plant that can smash through bricks and defeat enemies.
needagun - Reserve box holds the Billy Gun.
needaswitch - Reserve box holds a P-Switch.
needabomb - Reserve box holds a SMB2 Bomb.
needashoe - Reserve box holds a Kuribo's Shoe
itsamemario - Changes player into Mario.
itsameluigi - Changes player into Luigi.
ibakedacakeforyou - Changes player into Peach.
anothercastle - Changes player into Toad.
iamerror - Changes player into Link.
supermario128 - Clones player 128 times.
supermario64 - Clones player 64 times.
supermario32 - Clones player 32 times.
supermario16 - Clones player 16 times.
supermario8 - Clones player 8 times.
supermario4 - Clones player 4 times.
supermario2 - Mario and Luigi appear. Push down and the drop item button to switch from Mario to Luigi.
1player - Enables 1-Player Mode. Will delete any clones from the supermario codes.
2player - Enables 2-Player Mode.
bombsaway - Spawns a bomb in the character's hand.
firemissiles - Spawns a Bullet Bill in the character's hand.
greenegg - Spawns an egg with a green Yoshi.
blueegg - Spawns an egg with a blue Yoshi.
yellowegg - Spawns an egg with a yellow Yoshi.
redegg - Spawns an egg with a red Yoshi.
blackegg - Spawns an egg with a black Yoshi.
purpleegg - Spawns an egg with a purple Yoshi.
pinkegg - Spawns an egg with a pink Yoshi.
coldegg - Spawns an egg with a cyan Yoshi.
stickyfingers - With this, you can grab and hold any NPC.
donthurtme - This enables invincibility, although you can still fall off of edges.
framerate - Works like framerate code. Shows the current framerate.
speeddemon - The game's frames go as fast as possible, so the entire level's events happen faster.
shadowstar - Makes the player pitch-black. Allows the player to walk through walls.
hammerinmypants - Spawns a friendly Hammer Brother in your hands.
wariotime - Turns all on-screen enemies into coins.
stophittingme - Hits you.
boingyboing - Gives you a trampoline.
ahippinandahoppin - Allows infinite jumping.
wingman - If you have a leaf, tanooki suit, Yoshi, or Lakitu's Shoe, you gain infinite light.
captainn - With pause key you can stop time like a clock. (Does not work if pause key is Esc.)
moneytree - Gives you infinite coins.
flamethrower - If you have a Flower or Hammer Suit, it allows you to do Autofire when holding the run button.
sonicstooslow - This enables faster running.
imtiredofallthiswalking - Opens all paths on World Map.
anothercastle - Changes you to Toad.
illparkwhereiwant - Lets you walk around the world map freely.
donttypethis - A rain of bombs pour down and explode.
wetwater - Toggles the level's underwater status; changes the stage's background and music.
iceage - Freezes all enemies on screen (as long as they're affected by iceballs).
upandout - Gives you a Propeller Block.
burnthehousedown - Spawns a Propeller Flamethrower in your hands.
redigitiscool - This code is needed to save the game after using cheat codes.

[bossedit8]

There's already a thread for this that is stickied in the help & supports forum!

But this one doesn't list the newer 2.0 cheats while this one does... so yeah that can work out.

[Cedur]

welp, which ones are the new 2.0-exclusive ones?

[The0x539]

The cheats currently being added using Lua in Beta 4:

suicide
holytrinity
theessentials / theessenjls
liveforever
gdiredigit
launchme
boomtheroom
instantswitch
murder
dressmeup
undress
laundryday
thestarmen
getdown / geddan
foundmycarkeys
mylifegoals
mysteryball
itsvegas
getmeouttahere
rosebud
andmyaxe
hadron
groundhog
waitinginthesky
sosageyo
rinkamania
horikawaisradicola
jumpforrinka
rinkamadness
worldpeace
getdemstars
noclip
nowiknowhowameatballfeels

newleaf

superfightingrobot
eternalgreed
kingofthekoopas
dreamtraveler / dreamtraveller
bombingrun
cosmicpower
metalgear
ocarinaoftime
densenuclearenergy
unclesam
samusisagirl

[Zeldamaster12]

This thread already exists, please make sure a thread hasn't already been made before you post.