what are some single-player games with alot of replayability?

personally I like Minecraft, garry's mod, fallout, Skyrim. any other suggestions?

Dragon age origin is a good rpg with replayability

Minecraft, Left 4 Dead, Dead Island, Half-Life, World Of Warcraft

Its not related to the games you mentioned, but I'd recommend trying a game from the Metal Gear Solid series

Remnant from the ashes has a lot of replayability because everytime to start over the levels change, and the bosses change. You never play the exact same game twice.

If you are willing to download some mods, Factorio can be the biggest time sink of your existence.

The Factory mush grow

i think hades and binding of isaac you can play until you die

I replayed Dead Space 1 and 2 like 4 times each, great games, aged like wine

Deadfire maybe, is fun replay with other party.

you can get 2 pretty insane playthroughs of Undertale that are completely different