Get all three types of Pikmin in the Story mode, and the Challenge mode will be unlocked on the main menu.
In Pikmin, you can unlock the three types of Pikmin and new areas in the Story mode, and the Challenge mode on the main menu.
In Pikmin 2, you just get "The Key". In Pikmin 1 and I believe Pikmin 3, you have to beat the game.
To unlock Challenge mode, you need to collect The Key from the final floor of the Citadel of Spiders, a cave in the Perplexing Pool.
No, just story mode and challenge mode.
No you can not you can only play as Jordan when you finish the Jordan challenge and unlock the mode or use a cheat to unlock the mode.
Louie's Dark Secret in Pikmin 2 is a cinema that you unlock when you complete all Challenge Mode levels with pink flowers. If you want to know exactly what his secret is, then look a bit farther down, otherwise stop here for spoilers ahead. His secret is that he actually ate the carrots and not the space bunnies.
Challenge mode.
To unlock the final bonus video, you must get a "perfect" rating in all 30 challenge levels. This is indicated by a purple flower on the level select screen. The "perfect" flowers can be attained in one- or two-player mode by completing a level without losing any Pikmin. Keep in mind that to get a "perfect" rating, it is not necessary to get any treasure except for The Key on each sublevel.
You have to complete the Jordan challenge to unlock the mode-'Jordan creating a legend'.
You have to beat all challenges in challenge mode and get all the trophys in challenge mode.
you will unlock a secret stage!
Pikmin is not a two-player game, but Pikmin 2 could be played by two people in the Challenge and Battle modes.