In spite of widespread adoption of dual analog sticks, a few modern video game systems are designed without a second analog stick, namely the Wii's standard controller (whose lone analog stick is implemented in the Wii Remote's Nunchuk attachment), Sony's PSP and Nintendo's 3DS. While the Wii's abovementioned supplemental Classic Controller accessory and its initial backwards compatibility support of the GameCube controller allow for dual-stick control schemes in certain games, the PSP's complete lack of a second analog stick[3] and later the 3DS' initial lack of such feature have been criticized. Nintendo has since released an add-on for the 3DS that adds, among other things, a second analog "circle pad".