Proto:Sonic the Hedgehog 4: Episode I
This page details one or more prototype versions of Sonic the Hedgehog 4: Episode I.
Sonic the Hedgehog 4 - Episode I had... an interesting development cycle, to say the least. Three prototypes are known to exist (although one, a PS3 "Sony QA" build, is yet to be released publicly), all seemingly coming from the same timeframe.
| PartnerNET Prototype|
Xbox 360 build dated February 9, 2010, notable for causing such extreme fan backlash that the game's release was delayed to fix the cited issues.
| Japanese WiiWare Prototype|
Wii build also dated February 9, 2010, which had accidentally been published on the game's release date.
- All three prototypes bear strong resemblances to the iOS/Android version. They contain the two controversial "gimmick" levels, less-polished physics, and simpler Stage Select screen that were replaced in most releases.