"Super Smash Bros. 3DS" is already a success in Japan, where it was released on September 13, topping 1 million sales within 3 days according to data tracker Media Create.
It's the first of two "Super Smash Bros." games being released in short order, with a Wii U version on its way before the end of the year.
The cartoony, side-on fighting series features characters from across the Nintendo universe, including Mario, Princess Peach, Kirby, and Bowser.
From its beginnings as an alternative to the PlayStation's swish 3D fighters it became a cult success known for both approachability and depth.
With nearly seven years passing since the last series installment, this marks the first time a "Smash" game has released for handhelds, and this November's "Pokémon" titles a pair of Game Boy Advance remakes, "Smash" is set up to become Nintendo's biggest own-brand release of the year.
Some reports indicate that a number of players are plugging away at the game with such ferocity that their pocket consoles are suffering as a consequence; Kotaku's Japan correspondent compiled a photo spread of damaged handhelds whose circular slide pad had been wrenched off in the heat of battle.
Only a select few 3DS games have managed to break the 1 million mark over their opening three days in Japan, and the accomplishment puts "Super Smash Bros. for Nintendo 3DS" in the same category as "Pokémon X & Y" and "Monster Hunter 4." Both of those went on to clear 4 million sales domestically, and are among the console's all-time best sellers.
An international release for "Super Smash Bros." on 3DS is set for the week of October 3, while a firm date for the Wii U edition could coincide with the Tokyo Game Show, September 18-21; Nintendo does not usually attend, but holds a separate press event for important announcements.