If you could make anything into secret seed, no matter how complex, what would it look like?

[Asternove]

Adds Flowey to the game. He has control of your save file btw.

 

[Salty_]

"world^3" (Cubed)

The world generates a map 1/3rd of the size as the selected size, then makes every block 3x3 instead of 1x1, tripling the size back up, resulting in an incredibly blocky world.

 

[TWillyH]

“Minecraft” completely reworks the game to be like Minecraft. All prehm ores except for copper, iron, gold, diamond, emerald, amethyst, and whatever else is in Minecraft are removed. The missing ores can still be found in hardmode crates.

Obsidian armor is buffed to compensate for hellstone not existing and because it’s strong in Minecraft.

The other armors available (copper, iron, and gold) are changed so that there aren’t massive defense gaps. The missing ore armor sets are unchanged.

Any amount of water will instantly break falls, and lava can burn any item.

Furnaces take time to smelt items, and they inherit all cooking pot and glass kiln recipes.

Anvils are instead used to reforge. To make sure the goblin tinkerer isn’t useless, he always gives the best modifier at a high price.

Crafting tables have every single recipe from anvils and miscellaneous stations like the sawmill.

Zombies and skeletons will burn if exposed to the background while on the surface during daytime.

All bosses still work the same.