https://www.siliconera.com/how-to-unlock-bill-rizer-in-vampire-survivors-operation-guns/
How to Unlock Bill Rizer in Vampire Survivors Operation Guns - Siliconera
May 6, 2024 - Bill Rizer, one of the most famous Contra heroes, is one of the easiest Vampire Survivors Operation Guns DLC characters to unlock.
how to unlockbill rizervampire survivors