> For the complete documentation index, see [llms.txt](https://roadrunr-protocol.gitbook.io/roadrunr-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://roadrunr-protocol.gitbook.io/roadrunr-documentation/technology/gameplay/overall-picture.md).

# Overall picture

The CAR NFT when combined with the 3 part NFTs has the following attributes:

1. **Efficiency (E)** affects the $SDT and $CAR earnings per trip
2. **Resilience (R)** will be used to calculate the engine health after every trip
3. **Style Points (S)** will increase the chances of getting a Loot Box
4. **Type (T)** will be used to calculate the ratio of per mile reward for each mile
5. **Miner (M)** will enable more rewards when installed inside the car
6. **Health (H)** of the CAR NFT will also affect the $SDT and $CAR earnings on a given day
7. **Durability (D)** of the CAR NFT drastically reduces earnings if it goes below 20

**ERS values** can be increased by allocating attribute points, by improving the NFT grades and by **adding add-ons**. These add-ons can either be purchased from the ROADRUNR store or can be received as **in-game drops or Loot Boxes**. The number and quality of in-game drops depends on the Style Points (S) and increases with S. Each NFT can have the following grades:

* Common
* Uncommon
* Rare
* Epic
* Legendary
* Mythic

![](https://1870656896-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FiXl1yvFBfiXQ70cgjdGt%2Fuploads%2FMiHcyWZTevHpYAtm0RxI%2FScreen%20Shot%202022-07-08%20at%2012.40.54%20AM.png?alt=media\&token=a8f8d3f7-ca0d-434d-99f9-bcc7ab1d629a)

The NFT grades can be improved by add-ons on the NFTs. These add-ons can either be purchased from the ROADRUNR store or can be received as in-game drops. The number and quality of in-game drops depends on the Style Points (S) and increases with S. Type, Miner and Health (TMH) attributes don’t get impacted by NFT grades.