2D, because for some reason, the absolute best Sonic level design I've experienced can only be found in the 2D entries. Mostly the earlier ones.
3DS Friend Code: 0645 - 5827 - 5788
WayForward Kickstarter is best kickstarter: http://www.kickstarter.com/projects/1236620800/shantae-half-genie-hero
![](https://s3.amazonaws.com/ksr/assets/000/918/071/213b8f2cf675c7def32f26c6351632ae_large.gif?1379098713)