The Acropolis:

A Stranger

Hero Training I

Hero Training II (lvl 2)

Abandoned Satellite Station (lvl 40)

Hero Training III (lvl 5)

2378



Earth > Erechtheion:

Poseidons Mark (lvl 50)



Earth > Sol Complex:

Complex Data Terminal (lvl 10)



Earth > The Docks:

Cloaked Figure



Earth > Factory Yard:

Broken Machine



Moon > Shrine of Zeus

Under Zeus Throne (lvl 60)



Venus > Ember Caves

Shipwrecked (lvl 30)



Mars > Scarlands

Incoming Transmission



Earth > The Underworld > Lord's Watch

Deaths Door (level 99 and Neophoenix ship to UW)
(Yes, it is Death's Door, but wiki pages can't have punctuation in their titles)



Saturn > Hall of Souls:

Lunch with the Chat Titan (lvl 40)



Mount Olympus > Realm of Glass:

The Omega Syndicate and The Kronos Labyrinth (lvl 99 and have at least 100 Shards of Zeus)





For a list of Locked Chests, see the Locked Chest Codes guide