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All Places

There are a total of 26 places to explore in Sonamy Smash X Adventure Mode: The Diamond Inferno. A whooping 26. We are going to list them all here, and tell you HOW to unlock them. Please note, when you leave a place you may get attacked by badniks and you must defeat them to move on.
Smashland
Winter Mountain: Already unlocked/starter place.
The Chao Learning Library: Already unlocked/starter place.
Cergio: Defeat Tails in Winter Mountain.
Smash Cave: Defeat Dr. Eggman in Cergio.
Ninja City: Defeat Rouge the Bat (and Tails if he helps Rouge) in Smash Cave.
River Canyon: Unlock Ninja City.
Town of Daratris: Defeat Shadow in River Canyon and then talk to Amy in Ninja City.
Mobius Coastline: Walk on foot to Mobius Coastline.

Smash Kingdom
Minlo Fields: Use the X-Tornado to fly to Minlo Fields from Mobius Coastline.
Downtown City: Defeat Rouge in Minlo Fields.
The Windmill Village: Take the Smash Underground train to Windmill Village.
The Victory Lane: Walk on foot OR take the Smash Underground train to The Victory Lane.
Battlefield: Walk on foot from The Victory Lane.
The Mystical Forest: Walk on foot from The Victory Lane.
Blizzary Desert: Defeat Rouge, then defeat Dr. Eggman both in Mystical Forest.
Blizzary Desert’s Beach: Defeat the three thief travelers in Blizzary Desert to get the key.
Egg Flying Fortress (Front Garden): Be at least at level 50, defeated Black Doom in Icy Sky Land, talk to Silver in The Windmill Village.
Egg Flying Fortress: Defeat all badniks in the front garden then talk to Tails in Front Garden.
Egg Flying Fortress (Back Garden): Defeat. Dr. Eggman.

The Icy Region
Ice Sky Land: Be at least level 30, and talk to Nick in Blizzary Desert’s Beach.
Ice Sky Land Cave: Be at least level 35, and talk to Shadow and defeat him in Ice Sky Land.

Secret Places
Assistant Stadium: Beat Diamond Inferno.
Green Hill: Beat Diamond Inferno and talk to Sonic in Assistant Stadium.
The Road to Mushroom Kingdom: Beat Diamond Inferno and then defeat Omega.
Mushroom Kingdom: Defeat Bowser Jr. in The Road to Mushroom Kingdom.
The SOS Brigade: Beat Diamond Inferno, then talk to Blaze in Ice Sky Land.