Gamemode Exclusive Items
On the original game, by giving a palete value of 1 (full blue) to weapons, ammo, items, inventory items, buttons, cracks and cameras, these sprites would then be exclusive to multiplayer matches, meaning they would't spawn at all if playing a single player game. That idea was extended further on proDuke, so the mapper can set actual filters so certain sprites can only appear on some game modes. This improves the potential for map balance, so it's not needed to make different versions of the same map for different game modes.
