This is an unofficial continuation of the work started by Jabu, in order to further improve the game and facilitate any future hacking attempts.

General changes:

• All unused graphics and objects are removed.
• Animations and graphics are updated.
• It is created alternative patch to reduce the duration of oxygen (thanks Torridgristle)
• It updates the sound engine created by Ti_ (thanks Ti_)
• New background scroll renderer, code much more faster. (thanks Ti_)
• Patch is included to simplify the level selector trick.
• Several of the bugs that caused the game to crash are resolved.
• The “Continues” were reinstated (thank you Blast - Forever 2 and torridgristle)
• The error that causes graphics glitches at the beginning of the level is avoided.
• Various aspects of the entire HUD, fonts, position, some transition screens, etc. are changed.
• Various stages are edited to avoid dead end roads.

v1.4 + New title screen and Zones Selection. + Correction of the graphical glitch of the Continue screen. + Remapping of “Zone Selection” and “Continue” screen controls.

+ New block with clouds on Green Hill. + New complementary objects (Only one has new graphics) + Many micro adjustments in the levels.

+ Improvements when using the springs: (thanks woring) - When he climbs Sonic no longer suffers an automatic overtaking. - Upon falling Sonic automatically adopts his ball attack. - When bouncing off a star spring, Sonic bounces into a ball.

+ Springs now have sound effects (Recycled sound)

Other contributors:

Ramzet (Tester); RisteingTV (Tester); # (Technical advice); Cyneprepou4uk (Technical advice); SuperStarFox (Graphic advice)

Gameplay video: https://youtu.be/VdrmFnyW8JY

• Database match: Somari (Unl) [b3].nes
• Database: GoodNES (V3.23b)
• File SHA-1: 6CF18228CFB66D48B3642069979D4A5103CB8528
• File CRC32: 51589DAF
• ROM SHA-1: BB618E17CD21EAA0185DE3A3BF0028DCBBA6A0C3
• ROM CRC32: 318658D6