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Gamecube - Serious Sam: Next Encounter cheats

Get gold medals to unlock extra levels. Go to the "Level selection" 
screen and press X to bring up the "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 

All weapons: 
Finish the game with 33 "Gold" ranks.