Probably Rabi-Ribi for the full "stuck on an island" experience!

Hopefully the island I'm on still has bunnies on it, though...

Timberborn

Hmmm maybe Minecraft because of the limitless possibilities

Probably Minecraft since I can do a lot in there.

I think would take kenshi, this game is so massive, I could basically play it forever

Minecraft, with the Castaway Island map. Just for fun.

Celeste

I guess it'd be a game with a lot of replay value, and one that would not rely on external infrastructure and resources to still be playable. Based on that alone, I'd say that Pokémon Sapphire/Ruby/Emerald would be a good choice. I think its a point in the games where trainers can be battled over and over again, so unlike Gen1 you wouldn't have to start from scratch.

Maybe Minecraft, Terraria, Little Big Planet, whatever lets me create another world and forget that I'm stuck on an island lol

poe if it would work offline...

not into minecraft but probably best single game to spent the rest of the life with.

or factorio mhh

is there a sim game about escaping a lonely island?

assuming i have a computer, electricity(, and internet), one of crusader kings 2, hearts of iron 4, europa universalis 4

without computer, i have no idea. i can't even think of any single player traditional game right now.

warioware: mega microgame$

Half-Life with the SDK and compiler

It Takes Two

Anarchy Online (provided i have internet)
I have thousands of hours in that game.