Arguably harder then RLCraft and we don't even use Tough as Nails!
Survive the unforgiving environment around you while you level up your health, skills and tools. Automate everything with Buildcraft's auto-crafting tables and transport pipe system. The end goal is to craft an efficient and operational mass fabricator fueled by UU-Matter. Creating UU-Matter is no easy task, it requires immense power, you will need to craft solar panels, geothermal generators, nuclear reactors and other sources of power.