Pikmin 2 is very nice strategy game!
The game introduces playing as two people at once to solve puzzles together, just like most games. It has a new challenge mode, where you may solve the courses with a limited number of items and Pikmin. here are treasures spread across the area and thee is a hidden key that must be brought back to the ship to open a hole to the next floor. Another difference is that you have an unlimited number of days to collect every treasure.
The game introduces using items in the battlefield (Unlike Pikmin and like most games). The two items are both used in battle, in cases of a lot of enemies put in one place or just to battle a tough enemy.
This game introduces two hidden types on Pikmin, which are both needed to complete the story. There is also tree new hazards to watch out for. There is also a section where you may browse the enemy list and interact with them.
The final thing to know is that the story never seems to get boring, there are also new characters. If you have a friend, go to Challenge mode or Battle mode to work alongside each other or see who is a better leader!