Midwinter all the way !
1989, Open-world, single player. You start with a character, alone, only with skii and a gun, against a sudden military force in the island of Midwinter, in a frost-covered world, after an asteroid hit Earth and starts an ice age. You have to find and recruit other NPC that becomes playable once you've convinced them. Games is part turnbased (you play by pack of two hours), parn real time when you ski,drive,handglide or shoot enemies. Basically, you're creating a resistance force to stop the advance of the military and then take the fight back to them.
This game was revolutionary at the time, all in 8bit (Atari ST). I played this alot, it was amazing !









