The primary objective in Vampire Survivors is to survive waves of enemies while collecting experience points and gold. Players must defeat monsters, gain upgrades, and ultimately aim to reach higher levels while surviving as long as possible.

Leveling up in Vampire Survivors occurs when you collect experience points from defeating enemies. Each level gained allows you to choose new weapons or upgrades, enhancing your character's power and survivability against increasingly difficult enemies.

During leveling, you can choose from various upgrades, including weapon enhancements, character abilities, and passive skills. These upgrades allow you to customize your play style and adapt to different enemy types and challenges.

To unlock new characters in Vampire Survivors, you typically need to achieve specific goals or complete challenges. Common methods include reaching certain game levels, defeating particular enemies, or accumulating a set amount of gold. Here are the steps to unlock a character:
1. Play through different stages.
2. Complete objectives or challenges listed in the menu.
3. Gather enough gold by defeating monsters.
4. Check the character menu to see unlocked characters.

Weapon and item synergies in Vampire Survivors enhance your combat effectiveness when certain conditions are met. Combining specific weapons or items can lead to powerful upgrades or unique interactions. Understanding these synergies can significantly improve gameplay performance. To explore synergies:
1. Experiment by using different weapon combinations.
2. Observe how items interact during battles.
3. Refer to community guides or wikis for known synergies.
4. Adjust your loadout based on synergy bonuses observed in-game.