Obtain the required number of Golds to unlock these extras:
All Weapons-32 Golds
Ancient Rome-Addressing the Senate-9 Golds
Ancient Rome-Caesar's Sanctum-12 Golds
Ancient Rome-Praetorian Camp-3 Golds
Ancient Rome-The Forum of Trajan-7 Golds
Ancient Rome-The Forum Romanum-5 Golds
Feudal China-The Gate of Supreme Harmony-18 Golds
Feudal China-The Silk Road-15 Golds
God Mode-Obtain 41 Golds
Infinite Ammo-Obtain 34 Golds
Legendary Atlantis-The Corridors of Power-26 Golds
Legendary Atlantis-The Geothermal Tunnels-24 Golds
Legendary Atlantis-The Steam Tower-22 Golds
The Gallery-31 Golds