Remnants of Skystone

The mysterious Skystone was revered by three societies; until the night the Skystone shattered; spreading noxious Haze across the land, and vile Mimic creatures in its wake. For 200 years, the survivors have taken refuge in the sky. But today, they will take back the land.

Free to Play MMO
Choose from 3 playable classes
Sidescrolling, platforming adventure across massive maps
Team up with other players on Co-op Trails
Over 100 Missions and Quests
An airborne city with shops, townsfolk, and other players
Design your own Floating House
Decorate, display trophies, throw a party!
Join the Nidarian Guard for extra moves, Daily Quests, and more.

Here's the link: Remnants of Skystone

You will have to make an account on Kongegrate if you want to play past the Tutorial Mission.

Here's the wiki: Remnants of Skystone Wiki

Here are the 30 main missions:

1. Clear the Haze
2. Invading Pustossers
3. Abandoned Factory
4. Search for the Sump Pump
5. Sump Pump Parts
6. Bulkskin Invasion
7. Enter the Sewers
8. Redirect Power
9. Poison Quilltoads
10. Finish the Mimics
11. Enter the Forest
12. Dangerous Firegrubs
13. Ferric Camp
14. Camp Intruder
15. Stinkstriders
16. Fire Brigade
17. Fighting Fires
18. Charred Forest Rescue
19. Crawback Attack
20. The Remnant Site
21. Repair the Tramway
22. Locate Copperstone Mine
23. Exterminate the Stingers
24. Restore Power to the Mines
25. Rescue Cody
26. Shocksprite Purge
27. Find the Crash Site
28. Skylark Assistance
29. Tramway Repair
30. River Remnant

The three classes are: The Aeronauts, the Ferrics, and the Crags!

The three main areas are:

Steamport City, Hatchwood Wilds, and Ridgeback Highlands!

The three sub-areas are:

Steamport City         Hatchwood Wilds     Ridgeback Highlands

West End Ruins        Thicket Woods         Paydirt Summit

Gearlock Factory      Camp Calluna          Copperstone Mine

Steamport Sewers    Charred Forest          Deadrock Canyon

Enjoy the Game!