First, Android 17 says "Time to get serious!" as he delivers a right palm strike to the opponent's face. Then, he punches the opponent in the stomach and elbows them on the back. Finally, Android 17 reverse sweep kicks the opponent off the ground before kicking them away, inflicting a high amount of damage.
Android 17 uses this attack during his second battle against Piccolo. After Piccolo refuses to tell where Goku is hiding, Android 17 decides to use force and slowly flies over to Piccolo. The two have a stare down, and Android 17 suddenly attacks Piccolo with the "Now We're Playing for Keeps!" rush, though Piccolo manages to dodge Android 17's last two hits by somersaulting away. Piccolo praises Android 17's speed, but remarks that Goku's punches are harder.
Appearances in games
The technique is named Crazy Rush in the Dragon Ball Z: Legendary Super Warriors. It was named "Now We're Playing for Keeps!" in the Raging Blast games, where it appears as one of Android 17's Super Attacks.
In the Dragon Ball Z Collectible Card Game, this attack is called Power Strike.