A collaboration between Vampire Survivors and the legendary Contra is a match made in heaven. If you want to play with the shiny new characters, here’s how to unlock Bill in Vampire Survivors Operation GunsHow to get Bill Rizer in Vampire Survivors Operation GunsScreenshot: PC InvasionBill is hidden in a Coffin located deep into the stage. As the new area is pretty intricate, I recommend checking your map and heading east until you reach the map icon (pictured above). The map reveals the layout of the entire stage, including bridges and other pickups.Screenshot: PC InvasionYou can find Bill’s coffin to the northeast by the question mark icon. More specifically, The coffin is on a small section of the map that’s only accessible via a small entry from the south (pictured above). Once you interact with the coffin, you’ll unlock Bill, and he will appear on the character list when you start a game. If you want to play as Bill rig…