Co-Op Mode is the ability to play cooperatively with a friend using a second controller. For every game in the series, the multiplayer premise has been the same; two players can play (in hubs, bonus levels, and normal levels in every mode). Two people can play together, P1 or P2 alone, and either can drop out at any time. There are a few extra things; in LEGO Star Wars: The Complete Saga, there was a Multiplayer Battle Arena that took place on stages to knock each other out for points. Also, there is one exception to the rule; in the level Darth Vader, the players cooperate together to escape the crumbling area, and then battle each other for victory, playing as either Anakin Skywalker or Obi-Wan Kenobi.
Splitscreen[]
LEGO Indiana Jones 2: The Adventure Continues onwards have splitscreen co-op play. When the players split up, the screen will split and when they get back together the screen will merge. This wouldn't work in previous games as if you try to split up, you'll get stuck. Also, if one player falls off a big distance in previous games, one player will drop out automatically. The splitscreen is always used in open-world hubs.
Wii U Gamepad[]
The Wii U Gamepad has a second screen with the option for Off-TV Play. When this is activated in Co-Op, Player 1 plays on the Gamepad while Player 2 is on the TV without splitscreen or stick-together limitations. In every LEGO Wii U game with co-op except for LEGO Batman 2: DC Super Heroes, Player 2 can use the Pro Controller or the Wii Remote and Nunchuk while in the game mentioned, Player 2 can only use the Wii Remote and Nunchuk.