How to make minecraft better?

I want to make my minecraft more harder but not to hard i mean like a few mods that could change the game for good make it more interesting

I don't want any modpacks i need mods for 1.6.4 ONLY!

Guest

Try Better Dungeons, Infernal Mobs, Mo' Creatures, Battle Towers, or Terra Firma Craft.

Thomas S

Upgrade imagination.exe after that it should be fine

Koray