Terrible Lizards is single-player only. There is no co-op, no online multiplayer and no cross-play. Here is what the game offers instead and why.
Terrible Lizards Multiplayer
Terrible Lizards is a single-player game. There is no co-op, no online multiplayer, no invasion system and no cross-play. The Steam store page lists Single-player as the only play mode, and the console versions are the same.
That is a design decision, not a missing feature. The game's tension depends on isolation: one player, one character, one hit and no one to revive you. This page explains what the game offers in place of multiplayer and addresses the co-op questions that keep coming up.
Official source: Terrible Lizards on Steam — the store page lists Single-player only.
The short answer
There is no multiplayer mode. You cannot invite a friend, matchmake or play split-screen. The game does not require an internet connection after installation, and it does not have a server component.
The only "multiplayer" associated with Terrible Lizards is the Dead by Daylight crossover. That is a cosmetic collaboration inside Dead by Daylight, not a multiplayer mode in Terrible Lizards. The achievements page explains how the crossover rewards unlock.
Why it is single-player
The game's core loop is built around vulnerability. Jordan is a college student with no weapons, no combat training and no backup. Every chase is a one-hit death, and every checkpoint is a return to a moment before the mistake.
Co-op would change that in two ways. First, a second player would break the isolation that makes the park scary. Second, the game's movement systems are precise: wall runs, ledge grabs and bounce pads are tuned for one body. Adding a second player would require different level geometry, not just a second character.
The developers have not announced co-op, and the game's structure does not leave room for it. The bosses page explains how the encounters are designed around a single player.
What you get instead
The single-player campaign is the whole game. It includes:
- Four chapters with distinct areas and creatures.
- A story told through tapes, letters and environmental detail.
- Collectible sets with achievements and New Game Plus modifiers.
- A replay mode that changes movement rather than adding content.
The game is also short enough to play in a weekend, which makes it easy to share with someone in the same room. Passing the controller is the closest thing to co-op the game supports.
On Steam, the game supports Family Sharing. That is not multiplayer, but it lets another account in your household play the same copy when you are not using it.
The Dead by Daylight crossover
The crossover adds Terrible Lizards cosmetics to Dead by Daylight: a badge, a banner and a dinosaur charm. You unlock them by earning specific Terrible Lizards achievements, then claiming a code from the game's main menu.
The crossover does not add a DBD mode to Terrible Lizards, and it does not let you play as the Hybrid in DBD's trials. It is a promotional exchange between two single-player and multiplayer games respectively.
The Steam bundle (Dead by Daylight x Terrible Lizards) includes both games at a discount. If you already own one, check the bundle price before buying; Steam discounts the missing item rather than charging full price for both.
Performance and online requirements
The game does not require an online connection. There is no always-on DRM, no account link and no cloud save requirement. On Steam, Steam Cloud may sync your save if it is enabled, but the game runs offline.
The console versions install and run offline. Updates require a connection, but the disc or download does not check in while you play.
Sources

FAQ
Is Terrible Lizards co-op? No.
Does it have online multiplayer? No.
Is there split-screen? No.
Can you play with friends? Only by passing the controller. There is no networked mode.
Is the DBD crossover a multiplayer mode? No. It is a cosmetic collaboration in Dead by Daylight.
Does the game need internet? No, not after installation.
Will co-op be added later? There is no announced plan. The level design is built for one player.
Does Family Sharing work? Yes, on Steam.
What to play instead
If you want a co-op horror game with dinosaurs, Terrible Lizards is not it. If you want a single-player parkour horror game with a strong setting, it is one of the better recent examples. The platforms page covers where to buy it, and the how long to beat page explains the time commitment.
The lack of multiplayer is also why the game is cheap and short. There is no live-service budget, no season pass and no server costs. The price page breaks down what the purchase includes.
Terrible Lizards is a solo game about being alone in a place that was built for crowds. The absence of multiplayer is the point, not a gap. If that sounds like the experience you want, the walkthrough hub is the place to start.
More Terrible Lizards Guides
Chapter 3 of Terrible Lizards: the flooded electrical rooms, all four fuse circuits, Allosaurus arena hunts and the black biomass, explained.
Chapter 4 of Terrible Lizards: the Crew Lift key in Cavern B, the final Dennis chase, the moving-structure climb and how to reach the ending.
Every major character in Terrible Lizards: Jordan, Stella, Dalton, Elena, DJ and Dr. Fellows, plus the four Paleo Pals mascots and their species.
Every collectible set in Terrible Lizards: 16 amber samples, audio tapes, notes, stuffed animals and the Chapter 2 note that most players miss.
The Terrible Lizards demo has two parts: a story section and a gameplay section. What it covers, where to get it and what carries over.
Who is Dennis in Terrible Lizards? The mascot suit, the entity under Dalton's Dinos, DJ's imaginary friend and the evidence behind the main theory.
What happens at the end of Terrible Lizards: DJ, Dennis, the Crew Lift, Stella's car and the questions the game leaves open. Full spoilers.
How long Terrible Lizards takes: 6 to 10 hours for the story, 10 to 12 for completion, chapter-by-chapter estimates and what makes runs longer.
