Unlike previous games in the series, the game does not carry the Tomb Raider brand and will have a heavy emphasis on cooperative gameplay, both online or locally.
In the multiplayer, players will take the role as either Lara Croft or a 2,000 year old Mayan warrior named Totec. They will have to work together in order to stop the evil spirit Xolotl and retrieve the Mirror of Smoke. A single-player campaign mode will be available that will not include the non-playable character AI following or helping Lara. The video game was released for the Xbox Live Arcade on 18 August 2010, but online co-op gameplay will not be enabled until 28 September, the day of the PC and PlayStation Network release.
Each playable character will possess unique weapons and skills. Lara will retain her dual pistols with infinite ammo and a grappling hook. She will be able to use her grappling hook to make it across difficult gaps and Totec can ride along. Totec will carry spears which can be used as a weapon and on the environment. Both characters will carry unlimited "bombs" that can be dropped and detonated with a press of a button.
Tombs can be explored and some will have "booby-trap puzzles" to solve. The game will not have any loading times.
Guardian of Light may be played with a single player, and a second player may join at any time, whether online or locally. In the single-player campaign the only playable character is Lara; Totec will not be available to assist. Lara will have all the tools required along with new abilities to make it through her own unique adventure. The puzzles and bits of the map will also be different.
Story
Two-thousand years ago in ancient Central America, a battle began between Totec, the Guardian of the Light, and Xolotl, a dark spirit. After Totec defeated Xolotl he banished him and entombed himself in the Temple of Light along with the magical Mirror of Smoke to prevent it from falling into the wrong hands. In present day, Lara Croft finds the temple and Mirror but mercenaries follow behind and steal it from her. Xolotl and Totec are awaken from their tombs by the chaos and Xolotl kills the mercenaries and runs away with the artefact. Totec initially blames Lara for the whole disaster, but then realises that they will need to work together in order to retrieve the Mirror and defeat Xolotl.