# 7. Why do I need parts? How can I use parts?

To improve the effectiveness of your miner without breaking the bank, you will need certain components for crafting and merging. This is essentially the key to obtaining a more powerful miner at a reduced cost. There are 5 tiers of rarity for the parts:

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You can earn them as rewards by playing mini-games, or obtain them by opening common parts cases from the [<mark style="color:green;">**Season Store**</mark>](https://rollercoin.com/game/market/season-pass). Alternatively, you can purchase the parts you need from the [<mark style="color:green;">**Marketplace**</mark>](https://rollercoin.com/marketplace).&#x20;

It's important to keep in mind that crafting can be a very rewarding option as well. By crafting, you can potentially obtain a limited-run, high-powered machine that could greatly increase in value on the RLT market or provide you with a significant boost in mining power. Therefore, it's definitely worth considering crafting.