G.I. Joe: The Atlantis Factor

The invincible team is at it again. The sinister Cobra organisation has found a mystical artefact. They used it to raise Atlantis from the ground and set up a military base there. It is necessary to reach this artefact by shooting everyone right and left. Unlike the first part, this one is non-linear - you can choose your own route. You start out with a single character, but as you progress through levels you can rescue other soldiers and play as them (and get new weapons, too). Each character has its own characteristics: one can swim, one can crawl; strengths and weaknesses: one can jump higher, another has more health. Fighters and weapons can be upgraded. You can also use the walkie-talkies you find to summon one of the three helpers we rescue in the levels. Assistants can resurrect dead team members and replenish health and ammo.