You are a great scientist doing several experiments and babysitting your kid as well. As soon as you invent a precious crystal, the bats kidnap your kid and steal the crystal. They take them to a castle where there are hundreds of blood thirsty vampires haunting you. You step into the castle and fight the enemy with your photon gun. Use your WAD keys to move around and jump. To shoot a photon towards the enemy, you will have to use your mouse to aim towards him and left click to fire. The photons bounce around and reach an excited state and turn red. The red photons kill the enemy instantly. Try multiple kills for extra score.