Similarities between Metal Gear 2: Solid Snake and Metal Gear Solid 3: Snake Eater

Plot Elements

 * The beginning of the mission involves using a cargo-plane to perform a High Altitude Jump into an enemy region, and then working the way to the destination.
 * The initial mission of rescuing a scientist from enemy territory becomes more complicated as to revise the entire mission.
 * The female contact ends up getting romantically involved.
 * The main character ends up fighting their former mentor(s) and at least one of them giving a speech on how the loser of the fight is liberated from the battlefield and the winner will have to remain to fight a lifetime of endless battle.
 * The ending ends up having the main character going into Alaska with their love interest, only for one of them to abandon the other.
 * The scientist that was initially supposed to be rescued is believed to be dead (Sokolov comes back in Portable Ops and Madnar is mentioned in Metal Gear Solid 4).
 * A character who is openly an enemy of the main character is secretly aiding the main character in his mission.
 * A weapon developed by the enemy region was initially going to be mass produced, but the attempts were thwarted by the main character.

Battles

 * A boss wields stealth camouflage and attacks the main character.
 * A boss battle spans a larger battlefield than normal and the boss isn't found under normal circumstances.