Battle Stadium D.O.N (PS2 Gameplay) 

Battle Stadium D.O.N (PS2) - Characters: Goku vs. Luffy vs. Naruto - Stage: The Going Merry
Similar to the Super Smash Bros. series, the players are put onto either a moving or non-moving stage. Like Power Stone, these stages have some level of interactivity. Players must then fight their opponents. Unlike other fighters, D.O.N uses a combined health gauge, that is, decreasing the health of one player will in turn increase the health of the other players. Thus, in order for one player to win a fight, they must make their own health bar take up the entire bar. As such, a fight can potentially last indefinitely if no time limit is set. Also, there are in-game techniques that can be pulled off (i.e. Kamehameha for Goku and Summoning Jutsu for Naruto) and supers that can transform the characters into a new form (i.e. Naruto's Rasengan turning him into the Kyuubi and Goku's Genki Dama turning him into Super Saiyan). In addition, some characters can induce a temporary transformation during the battle (i.e. Sasuke's Sharingan and Luffy's Gear 2nd).