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- Valve
- Nintendo, as long as you only count EAD, Retro, Game Freak and Intelligent Systems. Nintendo has first-rate studios down to fourth-rate ones like Artoon*, Ambrella**, and Genius Sonority***.
- Camelot Software Planning

*Who ruined Yoshi on the GBA and then the DS

**Who created Hey You, Pikachu! That crime is enough to warrant death by nuclear strike.

***Who ruined any hope of a good 3D Pokémon game on the GC or Wii.