Tip: Switch palace switches normally disappear if you replay the level. However, if you insert them as direct Map16 and use the hex-edit at $00EEB2 in the ROM map, you can replay the level without a problem.
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Details for Sonic the Hedgehog 2 - Wing Fortress Zone
SMW Music - Sonic the Hedgehog 2 - Wing Fortress Zone
The extraordinarily frustrating but interesting tenth level in Sonic 2. Good for other airship levels, but could also function as a castle. Also good for levels with lots of SFX cutoff, though I'd personally really advise against that behavior in general.