You unlock them by making progress in single player.
Yes it does.
Metroid Prime is not multiplayer, however Metroid Prime 2: Echoes does feature multiplayer gameplay.
No, But that would be totally awesome.
you and three Friends can play in the multiplayer mode
Make sure that you have the original version of Metroid Prime: Hunters. A multiplayer-only demo was released, under the title "Metroid Prime Hunters: First Hunt" If you have that copy, you will be unable to play single player.
Metroid Prime: Hunters is a first person shooter played on the Nintendo DS in were on adventure mode you play as Samus Aran looking for "ultimate power" that was sent via a telepathic message but she is not the only one looking for it. Six others are too. in multiplayer mode, you can play as her or any other 6 hunters as you unlock them on adventure mode. it was released along with Metroid Prime 2: echoes in 2002.
Unfortunately, it's only the single-player campaign (no Metroid Prime 2: Echoes multiplayer). So it's only one player.
1) Metroid Prime 2) Metroid Prime Hunters 3) Metroid Prime 2 Echoes 4) Metroid Prime 3 Corruption 5) Metroid Prime Pinball 6) Metroid Prime Trilogy there are 6 Metroid Prime games
Unfortunately, no. This is because they are completely different games. First Hunt and Hunters can only connect on their own game, not to each other. Sorry.
You do not, since metroid prime is not in that game.
If you mean chronologically, then the order is: Metroid/Metroid:Zero Mission, Metroid Prime/Metroid Prime Pinball, Metroid Prime Hunters, Metroid Prime 2: Echoes, Metroid Prime 3: Corruption, Metroid II:Return of Samus, Super Metroid, Metroid:Other M, and finally, Metroid Fusion. If you mean by releases, then the order consists of this: Metroid, Metroid II, Super Metroid, Metroid Fusion, Metroid Prime, Metroid:Zero Mission, Metroid Prime 2: Echoes, Metroid Prime Pinball, Metroid Prime Hunters, Metroid 3:Corruption, and finally, Metroid:Other M.
For metroid prime ( Game Cube ver.), you need to have a gameboy advance with a completed save file of metroid fusion. connect it to a controller input with a cable (you need to buy one). On Metroid Prime Trilogy, you need to finished Metroid Prime on any level and buy it on the extra menu (it cost 1 orange token and 2 silver tokens and then activeted).