Next Level Games
From the Super Mario Wiki
Next Level Games is a Canadian video game company that has made three Mario video games that include Super Mario Strikers and Mario Strikers Charged. Other than those two games listed, they have also created other sports titles for the Nintendo GameCube (and competing consoles). They were also going to develop Super Mario Spikers, but development on that game was canceled in favor of Punch-Out!! and it is now classified as vaporware.
As well as the two titles in the Mario Strikers label, Next Level Games also developed Luigi's Mansion: Dark Moon for the Nintendo 3DS, the sequel to the Nintendo GameCube title Luigi's Mansion. Due to the success of the games, the studio co-founder announced they are now working exclusively with Nintendo.
The company was also listed as special thanks for the Nintendo 3DS version of Luigi's Mansion.