Pet Keys are a valuable resource in Survivor.io that can be used to unlock new pets, upgrade existing pets, and even revive fallen pets. Here's how to use Pet Keys:

How to Use Pet Keys in Survivor.io

Unlocking New Pets

1. Collect Pet Keys by completing levels, opening chests, or purchasing them from the in-game store.

2. Go to the Pet Altar in the main menu.

3. Select the "Summon" tab.

4. Choose the pet you want to unlock and click the "Summon" button.

5. Use a Pet Key to summon the pet.

Upgrading Pets

1. Collect Pet Keys by completing levels, opening chests, or purchasing them from the in-game store.

2. Go to the Pet Altar in the main menu.

3. Select the "Upgrade" tab.

4. Choose the pet you want to upgrade and click the "Upgrade" button.

5. Use a Pet Key to upgrade the pet.

Reviving Fallen Pets

1. Collect Pet Keys by completing levels, opening chests, or purchasing them from the in-game store.

2. Go to the Pet Altar in the main menu.

3. Select the "Revive" tab.

4. Choose the pet you want to revive and click the "Revive" button.

5. Use a Pet Key to revive the pet.

Other Uses for Pet Keys

In addition to unlocking, upgrading, and reviving pets, Pet Keys can also be used to:

1. Purchase pet skins from the in-game store.

2. Enter pet-related events and tournaments.

3. Unlock special pet abilities.