The Treasure Chest is a large treasure chest filled with gold and other valuables. Its point value depends on the game it is in; in Serious Sam: Xbox it gives the player 50,000 points while the Serious Sam 2 incarnation gives the player 5,000 points when picked up.
The Treasure Chest appears in single player and co-op modes in Serious Sam: Xbox and Serious Sam 2, but can only be found in Coin-Op Co-Op mode in Serious Sam HD and Serious Sam 3: BFE.
Its rarity depends on the game. In Serious Sam: Xbox, Treasure Chests are usually tucked into corners and semi-hidden alternate paths, while in Serious Sam II, it is only found in secrets.