This part of Project AXSX is what always made me curious. What available maps were going to be used? What music's going to be used for them? How are you going to know the names of the acts or what act number it is? This is literally just meant to be a post in order to get an official answer, but considering this isn't a chat and I like getting my ideas out there, I'll just tell you some ideas I have for the zones.

The zone order is going to be Jade Gully, Red Sands, Metal Blade, Crystal Frost, Galaxy Fortress and Death Egg. I thought of this because Toonjoey said it was in Chris Senn's plans or documents for the game. Or something like that, idk.

Jade Gully:
Act 1: Emerald Clouds - PC Demo Jade Gully (Music: x47 Emerald Clouds)
Act 2: Wolf Den - POV Saturn Demo Jade Gully (Music: x99 Tarantulas In The Grass)
Act 3: Bamboo Transit - That recently found Hirokazu Yasuhara Jade Gully with most of the textures from Act 2 (Music: x50 Wolf Den)
Boss Act - Fang the Sniper (Music: x56 Lost Boss)

Red Sands:
Act 1: Giza Speedway - GIZASPD (Music: x09 Giza Speedway)
Act 2: Pyro Pools - I don't even know... (Music: x04 Mummy Madness)
Act 3: Tombs 'n Traps - PC Demo Red Sands (Music: x08 Islam Prophet)
Boss Act - Guardian Sphinx (Music: x56 Lost Boss)

Metal Blade:
Act 1: Nightmare Bridge - idk (Music: x16 Black Harbor)
Act 2: Sewer Shock - again, idk. (Music: x21 Underdrowned)
Act 3: Necropolis - I DON'T KNOW OK?! (Music: x18 Concrete Pits)
Boss Act - Metal Sonic (Music: x56 Lost Boss)

Crystal Frost:
Act 1: Prism Chorus - PC Demo Crystal Frost (Music: x99 Crystal Valley)
Act 2: Cryogenesis - idk (Music: x37 Frozen Falls)
Act 3: Icegates - idk, but i was thinking of this act being centered around Blue Ocean (Music: x44 SiniSquid)
Boss Act - Darkpool Gorilla (Music: x56 Lost Boss)

Galaxy Fortress (I'll just make the acts' names up):
Act 1: Iron Program - [shrugs] (Music: x25 Spiral Staircase)
Act 2: Technoweb - vyvgwvwcghwvwc idk (Music: x29 Iron Program)
Act 3: Mesh Machine - screw it i'm out (Music: x28 Technoweb)
Boss Act - Titan Tank (Music: x56 Lost Boss)

Death Egg:
HUB - The planned Death Egg HUB (Music: x27 Mesh Machine)
Act 1: Factory Robo - eh (Music: x31 Factory Robo)
Act 2: Proving Grounds - PC Demo Death Egg (Music: x26 Proving Grounds)
Act 3: MegaBase Control - lol k (Music: x32 MegaBaseControl)
Act 4 (Secret): Assault Station - the one with the conveyor belts and such (Music: x99 Destructor)
Boss Act - Mecha Mite (Music: x56 Lost Boss)
Final Boss - idk. just something more climactic, please. (Music: x23 Assault Station)

Bonus Levels:
Special Stage - Andrew's already making that. (Music: x99 Base Jump)
Christmas Mountain - That scrapped Christmas level (Music: x99 Shield of Discovery)

Also, I planned x53 Options for certain menus, x56 Lost Boss for the boss music (you might've noticed that already), x99 Pickup1 for the 1-up jingle, x99 Zone Done for completing the act, x99 Death for the Game Over jingle and the first part of x99 Rebirth for the Continue? screen music.

Let me know what you think, guys!