Single-player games like Portal with RTX
Below are 8 single-player Steam games similar to Portal with RTX, ranked by player overlap. Every pick carries Steam's Single-player category, so multiplayer-only titles or always-online games don't sneak in. imho.run pulls the category data from Steam directly — Single-player here matches what the store labels.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Portal with RTX page.
Ranked picks
- 1
Portal
Single-player alternative to Portal with RTX — playable solo, no multiplayer required. Shares Action with Portal with RTX.
Portal™ is a new single player game from Valve. Set in the mysterious Aperture Science Laboratories, Portal has been called one of the most innovative new games on the horizon and will offer gamers hours of unique gameplay.
- 2
Portal 2
Single-player alternative to Portal with RTX — playable solo, no multiplayer required. Shares Action with Portal with RTX.
The "Perpetual Testing Initiative" has been expanded to allow you to design co-op puzzles for you and your friends!
- 3
Black Mesa
Single-player alternative to Portal with RTX — playable solo, no multiplayer required. Shares Action with Portal with RTX.
Relive Half-Life.
- 4
Horizon Zero Dawn™ Complete Edition
Single-player alternative to Portal with RTX — playable solo, no multiplayer required. Shares Action with Portal with RTX.
Experience Aloy’s legendary quest to unravel the mysteries of a future Earth ruled by Machines. Use devastating tactical attacks against your prey and explore a majestic open world in this award-winning action RPG!
- 5
Little Nightmares
Single-player alternative to Portal with RTX — playable solo, no multiplayer required.
Take on the role of Six, a lone child lost in a massive metal vessel known as the Maw, surrounded by dangerous, distorted versions of adults. You’ll need to do your best to escape in one piece or your fate will be worse than you ever dared dream.
- 6
Hollow Knight: Silksong
Single-player alternative to Portal with RTX — playable solo, no multiplayer required. Shares Action with Portal with RTX.
Discover a vast, haunted kingdom in Hollow Knight: Silksong! Explore, fight and survive as you ascend to the peak of a land ruled by silk and song.
- 7
Echoes of the End: Enhanced Edition
Single-player alternative to Portal with RTX — playable solo, no multiplayer required. Shares Action with Portal with RTX.
Embark on a perilous journey to rescue your brother and prevent a looming war. Harness the power of devastating magical abilities to conquer enemies, traverse treacherous landscapes, and unveil the hidden history of Aema.
- 8
The Turing Test
Single-player alternative to Portal with RTX — playable solo, no multiplayer required.
The Turing Test is a challenging first-person puzzle game set on Jupiter’s moon, Europa. You are Ava Turing, an engineer for the International Space Agency (ISA) sent to discover the cause behind the disappearance of the ground crew stationed there.