Ghosts hid near by the house. Bomb them to the heaven! Hit the ghosts with the help of "Triangle" with consideration of physics rule, like grativity, air resistence, reflection rule and particles life time... Easy level : Relax and Fun. Common sense would work. Middle level : Reflection + Grativity + Air Resistance + Particle Life Time ... Hard level : One shot only to kill all ghosts. Open your eyes before you fire!