It is his version of the Continuous Energy Bullet, but each blast is more powerful than a normal blast. Aside from its increased potency, the extreme rapid fire makes it hard to miss.
Gotenks uses this technique against Super Buu outside the Hyperbolic Time Chamber: Gotenks continuously fires the Die Die Missiles until Piccolo tells him to stop as it can destroy the Dragon Balls if one is near their location, after this, Gotenks does not notice Super Buu regenerates behind him and he therefore gets hit by him from behind. Gotenks later uses this technique against the first form of Hirudegarn, without succeeding in doing any real damage to the demon as Hirudegarn simply uses a cocoon to block the blasts and transforms into his final form.
Video game appearances
Gotenks uses the Continuous Die Die Missile in several video games: the Butōden series, the Budokai series, the Budokai Tenkaichi series, Dragon Ball: Zenkai Battle Royale, Dragon Ball Z: Battle of Z, and Dragon Ball Xenoverse. In addition of using it as a super attack, Gotenks uses the Continuous Die Die Missile as part of his meteor attack Super Saiyan 3 Meteo Missile in Dragon Ball Z: Ultimate Battle 22.
In Dragon Ball Xenoverse, it appears under the name DIE DIE Missile Barrage and is one of Gotenks' Super Skills. If the Future Warrior takes on Gotenks as a Master, they can learn the technique from Gotenks after completing their first training mission with Gotenks. It is the second skill the Future Warrior learns from Gotenks. Additionally the Future Warrior must use this attack in Gotenks second training mission by defeating Gotenks with the Continuous Die Die Missile barrage. Successfully using this attack to finish the mission allows the Warrior to learn the Super Ghost Kamikaze Attack.
"Fires a barrage of Ki Blasts at the opponent. Each blast has a weak homing ability."
— Dragon Ball Xenoverse 2 Tutorial description
In Dragon Ball Xenoverse 2, DIE DIE Missile Barrage returns as one of Gotenks' Super Skills which the Future Warrior (Xenoverse 2) can learn by completing School Quest: "Lesson 2" of Gotenks' Training. In that lesson the Warrior can practice the technique while fighting multiple Cell Jrs (which Gotenks later reveals had taken over the lake he likes to hang out at) alongside Gotenks. While each blast has a weak homing ability, it has a fast rate of fire.