# Upgrades

**Upgrade Parts** improve AXIS ARC-Forges and make certain actions possible during the game.

### Upgrade Facts

* Can be built on any ARC-Forge.
* Can only be equipped to machines of the same **Class** on which it was built, and all ARC-Forge Classes *below* it.
* They do not require **Processing**. They are ready for use immediately after building.
* Given their R\&D nature, **Upgrade builds** have a **lower success rate**.
* Alloy Value, Complexity, and Purity **don't** apply to Upgrades.

{% hint style="info" %}
All **Upgrades** are optional. **Assemblers** are the only upgrades that are necessary for building Alloy Constructs. Mechikits and Xtended upgrades are important for avoiding downtime on your ARCs.
{% endhint %}

There are a total of 8 different **Upgrades** that are selected at random when choosing to make an **Upgrade Part**. The player cannot choose which **Upgrade** to build. It will be allocated at random with certain probabilities.

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Stocking up on **Upgrade** parts is a prudent way to run a Manufactory. Players can also buy and sell **Upgrades** in the **Alloy Market**. Building only upgrades and selling them is just one way to play and earn in **Alloy Space**.
