The plot of Pikmin 1 is that you crash land on a strange planet and have 30 in game days in which to collect enough pieces of your spaceship to get it working again
The plot of pikmin 2 is that you are looting for treasure.
So both revolve around using pikmin to carry items back to your base. You can get more pikmin bykilling monsters and taking the corpses back to your base.
You control the game as Olimar (in Pikmin 1) or Olimar and Louie (Pikmin 2) You can then order or throw the pikmin around in order to get past monsters or obstacles.
There are 3/5 types of pikmin in games 1 and 2 respectively and they each have different abilities
It is an RTS, but not a generic starcraft rip off type of RTS







