Upgrades

An upgrade is an item that can be crafted together with machines to increase their output.

Upgrades go in tiers: Upgrades must be done sequentially. (i.e. you can go from iron to gold, but not from stone to diamond)
 * 1) Stone
 * 2) Iron
 * 3) Gold
 * 4) Diamond

Crafting

 * 2x Redstone Dust
 * 2x Lapis Lazuli
 * 4x Iron Ingot


 * 2x Redstone Dust
 * 2x Lapis Lazuli
 * 3x Gold Ingot


 * 2x Redstone Dust
 * 2x Lapis Lazuli
 * 3x Diamond