Monster World IV — Cheat codes

Debug Menu
When in-game, hold A + C + START on controller 2, then press B + START on controller 1. A new menu should appear, where you can teleport to any screen/room/door or change the characters position. Press B + START on controller 1 on the selection you want to go to. Press START to exit. Or hold A on controller 2, then press START on controller 1 to see the credits roll.

Glitches

Get Pepe Early
When you meet the conditions for the magic merchant, go to him and buy the debug armor. Then, open the inventory menu (press start). Select the debug armor. It should say "would you like to raise Pepe to level 1?". If you do, press a or c, then close the menu. If you want level 2, say no, then say yes when it says if you would like to upgrade pepe to level 2, and so on for level 3.
Once you do this, close the menu, then leave the room/area you are in. Once you enter the next room, you should have pepe.
However, if you use level 1 pepe for blowing out fire or anything like that, then the game will softlock, so level up before doing advanced actions.

Easter Eggs
Lucky 7,777 Gold
Farm gold from enemies, if your gold reaches 777, you will automatically be rewarded with an additional 7000 gold.

Secrets

Debug Shop
When you reach Rapadagna, do not talk to the sage at the entrance that lets you save. Go left and talk to one of the two guards to enter the castle courtyard. Head to the top right of the screen to enter a long, apparently empty screen with bushes in the background. Go towards the group of bushes on the right side of the screen; keep pressing up on the left side of them where they begin. You will eventually enter the Debug Shop, where you can buy debug equipment which is the same strength as Legendary equipment but with additional debug features. Every time you talk to him, he'll give you 9999 gold. Stock up on as much gold as you want, and then buy out all the equipment and he will disappear.

Infinite jumping
Anytime after getting Pepe, stand at the spot you want to do the jumping at, then hold down UP and A (the "call" button). Then, jump while pressing attack at the same time. Do not release the call or up buttons at all. When you hear Pepe's chirp, repeat the upward stab. Then, repeat until you reach the desired point.
You have to time the jumps precisely, and if you time it too late, you will fall.

If you use this in Rapadagna, all the way at the far right past the town, were that merchant with the camel is, you can go past the wall to access the stream sanctuary early.

Sound Test Menu
To open the hidden sound test menu, at the title screen when New Game is selected. Press up, down, up, down, left, left, right, right. There is 53 sounds in total, press up/down to select them, and Start button to hear them.