Serious Sam - Next Encounter - Platform: Playstation 1

Cheat:
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By getting gold medals it is possible to unlock extra levels. 
On the Main level select screen press the X button to enter 
"The Lost Levels" menu. 

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 
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