> For the complete documentation index, see [llms.txt](https://docs.birds.dog/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.birds.dog/ai-bird-game/boosters.md).

# Boosters

To reduce the waiting time each time you upgrade your level (of both Egg and BIRD), use the boost feature. This feature is unlocked by inviting friends to use the BIRDs app. The more referrals you have, the better booster you get for your upgrade process.

Note that you the booster is not updated automatically. Once you reach a certain number of referrals, you would need to enable the booster within the "Earn" section on the app.

<figure><img src="/files/9Gz0H4oJFX4ePl7SJ258" alt="" width="375"><figcaption></figcaption></figure>

| Level | x Speed | Number of friends |
| ----- | ------- | ----------------- |
| 0     | 1.0     | 0                 |
| 1     | 1.2     | 1                 |
| 2     | 1.4     | 5                 |
| 3     | 1.6     | 10                |
| 4     | 1.8     | 25                |
| 5     | 2.0     | 50                |
| 6     | 2.5     | 100               |

<figure><img src="/files/vxGaUoAOjVM0qE4ku0V3" alt="" width="296"><figcaption></figcaption></figure>

Invite friends or use SUI to upgrade level

<div><figure><img src="/files/pDzWEkRlJD8DGEAL7YAW" alt=""><figcaption></figcaption></figure> <figure><img src="/files/q0HnavqrVmvPJrkPtkWB" alt=""><figcaption></figcaption></figure></div>


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