|- Tourian -|
This place is all blue already, without needing to find a map console... there are Metroids that you have to kill to unlock the grey doors... and being shot at by rinkas at the same time, really pressures you to take out the metroids quickly...
a room with some invincible giant bugs that you don't need to kill, and can easily just screw attack past them... then a room where a chozo statue disintigrates into sand and the grey door unlocks... more unmoving enemies that disintigrate into sand when you touch them... then suddenly you see a living giant invincible bug who gets eaten by a giant metroid and turns into sand... then the giant metroid eats Samus, but stops just one energy unit away from killing her... there's that shrubbery like in M2 that could only be destroyed by the baby metroid in that game, but now your plasma beam can also destroy it.
this is some really crazy good atmosphere... you really get the sense that this area that used to be inhabited by normal mosters got ravaged by these Metroids... and you see why it was blocked off by the boss statues.
right after that you find a missile/energy recharge room... then an empty hallway with mechanical looking structures, at the end is a boss door... after that is the classic mechanical looking area from M1, with Rinkas everywhere..., and the Mother Brain hall...
fucking A+++ ending...
this was done in the earlier 2 games as well, but I really love how the game never explicitly tells you to get back to your ship to end the game... it just says "Self destruct sequence activated" and you're just supposed to know to go back to where you started the game.