Resident Evil: The Mercenaries 3D is a standalone expansion of the popular "The Mercenaries" mini-game from the most recent Resident Evil games. Unlike past Resident Evil games, this game focuses only on "The Mercenaries" game and offers several stages and characters from the Resident Evil franchise. Resident Evil 4 and 5 are the main focus in this collection with many of the stages and characters taken from both of those games. The gameplay is much like the advanced RE4-style gameplay that was seen in Resident Evil 5, but players now have the ability to aim and shoot while moving.
Players choose a character and race against time to complete each stage's objectives in order to advance to other stages. Scores are given for every enemy defeated and bonus points are given for defeating boss enemies. Time bonuses are given for defeating enemies with melee kills and there are several time bonuses and bonus point chests hidden throughout stages to help boost the overall score. Mercenaries 3D has several unlockable stages and characters that are awarded for advancing in the stages. Along with most Mercenaries characters from Resident Evil 4 and 5, Claire Redfield returns with her own set of attacks for this installment in The Mercenaries. The game can be played either solo or players can go online and team up with another player through a Wi-Fi connection and play each stage in duo mode.
This game is also known as Biohazard: The Mercenaries 3D in Japan.