Jet Force Gemini

Jet Force Gemini is a third-person shooter with shoot 'em up and action-adventure elements, in which the player controls the player character from a third-person perspective in a 3D environment. The game places strong emphasis on shooting large numbers of enemies while dodging their attacks. Weapons have no magazine restrictions and include grenades, a pistol, a machine gun, a sniper rifle, a flamethrower, and rocket launchers, among others. Although much of the game is spent in battle, the player has the ability to jump, hang from ledges, swim, and fly using jet packs , when needed.

In combat, the player is free to set on a manual aiming system with the targeting camera fixed behind the character's head. When using this technique, a crosshair appears on screen and the player character becomes translucent so that players can aim and shoot with finesse. By contrast, when walking around, the game plays similar to a 3D platformer . In the game's single-player mode, the player must explore a galaxy that is composed of 15 nonlinear worlds.

Each world is composed of a series of stages with areas interconnected by different types of doors. Most doors open automatically, but some require a special action to be unlocked. For example, some doors require the player to defeat all the enemies in the area, while others may require a specific key. Although the player has a certain amount of health which decreases when attacked by enemies, health-recovery gems and ammunition crates can be collected throughout the world to increase the player's resources.

Power-ups can be found to expand the player's health and ammunition capacity. While progressing, the player can take control of three different characters: Juno, Vela, and Lupus. Each character has a special ability that allows them to uncover areas which the other characters cannot reach. Juno can walk through magma safely, Vela can swim underwater indefinitely, and Lupus can hover for a short period of time.

Therefore, choosing the right character for the right stage is critical in order to complete the game. Initially, the game forces the player to use the three characters individually until they reach a meeting point. Once they reach the meeting point, all of the worlds can be tackled with any character in any order. The overall objective of the game is to explore all the galaxy to collect several starship parts and save a large number of Tribal survivors.

Tribals can potentially be killed by weaponsfire, requiring the player to restart the encounter in order to save them. The player must collect all 12 ship parts and 282 Tribals to access the final stage. In addition to the single-player mode, Jet Force Gemini features a multiplayer mode where two to four players can compete in traditional deathmatch games. Options such as the weapons available, the winning condition, and time limit can be changed to match player preference.

Some multiplayer aspects, such as levels and characters, must be unlocked by finding the corresponding secret in the game's single-player mode. Players can unlock racing mini-games that are played from an overhead perspective, as well as a firing range challenge, where players must shoot numerous targets while the game automatically follows a predefined path. Jet Force Gemini features a no split-screen co-operative mode where a second player may take control of Floyd, a floating robot that automatically follows the main player character in the single-player mode.