Aspect Co. Ltd (nowadays known as Aspect Digital Entertaiment) is a Japanese video game company founded in 25 March 1991. Aspect is known for developing numerous video games for Sega's Master System and Game Gear through the 1990's. Aspect has also developed numerous Sonic the Hedgehog platforming games and spin-off titles for those systems.
- Sonic the Hedgehog 2 (Game Gear and Master System)
- Sonic Chaos
- Sonic the Hedgehog's Gameworld
- Sonic the Hedgehog Triple Trouble
- Tails Adventure
- Sonic Blast
- Aspect Digital Entertaiment - The official Japanese website.