These are things players can unlock and gain access to while playing the game.
“Special Weapons are the most diverse weapon type by far. This type is included in all games up...Special Weapons
“Difficulty levels determine the power and quantity of the Ravagers, and, in Insect Armageddon...Difficulty Levels
“A list of the various sniper rifles found throughout the series. Sniper rifles are not available...Sniper Rifles