def _new_pieces(self):
new_pieces = []
to_spawn = self.times < self.t
self.times = np.delete(self.times, to_spawn)
num = np.sum(to_spawn)
for i in range(num):
piece = Piece()
piece.explode(self, self.max_mass, 0, 25)
self.mass -= piece.mass
self.pieces_left -= 1
new_pieces.append(piece)
return new_pieces
