There are some my suggest game 3d PC offline for you:

1. What Remains of Edith Finch
2. Night in the Woods
3. The Surge
4. Call of Cthulhu
5. Tacoma
6. Syberia III
7. Rising Storm 2: Vietnam
8. Strafe
9. Absolver
10. Fortnite
11. Friday the 13th: The Game
12. ELEX
13. Get Even
14. Shenmue 3
15. Kingdom Come: Deliverance