> For the complete documentation index, see [llms.txt](https://saferoadclub.gitbook.io/src-ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://saferoadclub.gitbook.io/src-ai/safe-road-club-systems/nft/level-up-synthesis.md).

# Level up(Synthesis)

For car NFT level 1 to 4, no NFT synthesis is required to level up.

For level 5 and beyond, you can level up your NFT by synthesizing two NFTs(NFT synthesis). 

<figure><img src="/files/pz9Sm5XS19ttjLsQhU3v" alt="" width="563"><figcaption></figcaption></figure>

If the synthesis is successful, the target vehicle levels up, and auxiliary NFT burns away.

Leveling up provides two upgrade points and longer reward distance. Upgrade points can be invested in two attributes: Stealth and Endurance.&#x20;

## Synthesis cost

NFT synthesis cost an extra NFT, and fees in $SRC. Synthesis success rate depends on the target NFT level to upgrade.&#x20;

| NFT Level | burn NFT required level | synthesis fee (SRC) | success prob(%) |
| --------- | ----------------------- | ------------------- | --------------- |
| 1         | -                       | -                   | -               |
| 2         | -                       | 25                  | -               |
| 3         | -                       | 25                  | -               |
| 4         | -                       | 50                  | -               |
| 5         | lv1                     | -                   | 100%            |
| 6         | lv1                     | 50                  | 100%            |
| 7         | lv1                     | 50                  | 100%            |
| 8         | lv1                     | 50                  | 100%            |
| 9         | lv1                     | 50                  | 100%            |
| 10        | lv2                     | -                   | 100%            |
| 11        | lv2                     | 75                  | 100%            |
| 12        | lv2                     | 75                  | 100%            |
| 13        | lv2                     | 75                  | 100%            |
| 14        | lv2                     | 100                 | 100%            |
| 15        | lv3                     | -                   | 100%            |
| 16        | lv3                     | 150                 | 100%            |
| 17        | lv3                     | 150                 | 100%            |
| 18        | lv3                     | 150                 | 100%            |
| 19        | lv3                     | 150                 | 100%            |
| 20        | lv4                     | -                   | 100%            |

*\*Table for sythesis cost can vary*


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