The tip serve is a serve where the server first hits the ball high against the wall behind them. The opponent moves forward to the net where they anticipate the ball will land, then the server also moves towards the net and lightly tips the ball over their opponent and landing it in their back court. Used in tandem with a fake jump, the wide variation in landing positions makes this a difficult serve to defend against. This serve is used by the Slime Master in One Slime.