Finish the game with the amount of GOLD ranks
below to get the bonus levels.  Then go to the Level Select screen
and press X to see the LOST LEVELS
Ancient Rome : Praetorian Camp: 3 GOLD ranks
Ancient Rome : The Forum Romanum: 5 GOLD ranks
Ancient Rome : The Forum of Trajan: 7 GOLD ranks
Ancient Rome : Addressing the Senate: 9 GOLD ranks
Ancient Rome : Caesar's Sanctum: 12 GOLD ranks
Feudal China : The Silk Road: 15 GOLD ranks
Feudal China : The Gate of Supreme Harmony: 18 GOLD ranks
Legendary Atlantis : The Steam Tower: 22 GOLD ranks
Legendary Atlantis : The Geothermal Tunnels: 24 GOLD ranks
Legendary Atlantis : The Corridors of Power: 26 GOLD ranks
The Gallery: 31 GOLD ranks