AlphaDream Corporation is an independent third party developer from Japan. So far, it has been developing handheld games for Nintendo ever since 2002. They are best known for their comedy RPG series Mario & Luigi. Nate Bihldorff of Nintendo Treehouse said that AlphaDream was an excellent team to work with because of how fun they were. He explained that they knew the Mario series extremely well and thus were a perfect fit for creating the Mario & Luigi series.