In later levels, serious bombs usually appear before a big fight begins. In The Second Encounter, the first serious bomb appears in Valley of the Jaguar, while another one can be found behind a house near the 'bloodbath secret' in The City of the Gods. The serious bomb is absent from Serious Sam 3: BFE, Serious Sam 3 VR: BFE, and Serious Sam 4, being replaced by the C-4 Demolition Charge and Mini-Nuke instead. They often appear before a big fight begins so that the player can stand a chance, should they be unable to fight a large horde of enemies at once. Serious bombs are very rare weapons and the player can only carry a limited number of them, thus they should be used sparingly and only as a last resort if the player is absolutely overwhelmed by enemies. In Serious Sam: Double D: XXL, the serious bomb is launched from a serious bomb launcher the launcher has to be fully charged to be able to release the bomb. In other games, the player must take out the serious bomb, then hit the fire key in order to start the countdown. How the player uses it depends on the game in The Second Encounter, the player simply needs to hit the '0' key to start the timer. When the fire key is pressed, Sam will light the bomb's fuse, and it will take a few seconds to warm up, and afterwards will explode, killing every non-boss enemy within a 750 meter (in-game) radius of the player. It is held in one hand, while Sam holds a lighter in the other.

The serious bomb is an extremely powerful handheld explosive. 4.1 Serious Sam VR: The Second Encounter.

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