> For the complete documentation index, see [llms.txt](https://docs.perplay.io/perplay-whitepaper/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.perplay.io/perplay-whitepaper/game-fi/item/engine.md).

# Engine

Engines are items that can be obtained by disassembling NFTs owned by the user.\
Engine items cannot be traded in the in-app market.

<figure><img src="/files/FDKbOdsHjJeaVATTczsT" alt=""><figcaption></figcaption></figure>

**\[Epic Grade NFT Engine Slot Equipment]**

Engines can be equipped to the engine slot of an epic-grade NFT to enhance its stats.\
There are four grades of engines corresponding to the grade of the disassembled NFT, and the stats for each grade are as follows:

<figure><img src="/files/vBzMotXeUwaN9HIMVwV1" alt=""><figcaption></figcaption></figure>

**\[Auxiliary Role for Evolving to Epic Grade NFT]**

Elite engines can play an auxiliary role when evolving elite-grade NFTs to obtain an epic-grade NFT.

1. Increased Plus Mark Probability\
   By using an elite engine when evolving four elite-grade NFTs to create an epic-grade NFT, the probability of obtaining a plus mark is increased.
2. Increase in Minimum Basic Stat Range\
   By using an elite engine when evolving four elite-grade NFTs to create an epic-grade NFT, the minimum value of the basic stats of the resulting NFT can be increased.

<figure><img src="/files/0Y4E2VqP2AYkKuPE8yfG" alt=""><figcaption></figcaption></figure>