CheatCodes.com has all the official Sonic Advance + Sonic Pinball Party GBA cheats to unlock everything. If you know of any that we don't have, please let us know.
All published and official codes as of Wednesday June 19, 2013 for Sonic Advance + Sonic Pinball Party are shown below.
The special springs in sonic advance lead to special stages where (if completed) you obtain a chaos emerald. The special springs are in Neo Green Hill zone act1 (red), Power Plant act2 (blue), Casino Paradise act1 (yellow), Ice Mountain act1 (green) and 2 (clear), Angel Island act2 (light blue), and Cosmic Angel act2 (purple).
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