Duo Survival is a 2-player cooperative puzzle platformer developed by 7Spot Games, a Lithuanian browser game studio, released in 2020. Two survivors navigate a zombie-infested post-apocalyptic world, solving puzzles and activating mechanisms to reach the exit of each level. The goal across the whole game is to find the cure for the virus. It runs free in any modern browser on PC and mobile, no download required. Two sequels exist — Duo Survival 2 and Duo Survival 3 — both by the same developer with the same controls and an expanded puzzle set.
Contents
Controls
Both characters share the same action set — just different keys. In solo play, one person uses both columns.
| Action | Character 1 | Character 2 |
|---|---|---|
| Move left / right | Left / Right Arrow | A / D |
| Jump | Up Arrow | W |
| Kick / Throw bottle | Down Arrow | S |
The kick and throw-bottle action is the same key. Context determines which happens — near a zombie it kicks, near a throwable bottle it picks up and throws. Most players discover the throw mechanic late because they never press the down key near objects.
Characters
The two survivors are a male and female character. Their abilities are differentiated by what each handles better in puzzle design — one reaches high places and navigates tight passages more effectively, the other is better suited for moving heavy objects and clearing zombie groups. Neither character has a published name in official sources. Character assignments to keys are fixed: Character 1 (arrow keys) and Character 2 (WASD) do not change between levels.
How Levels Work
| Solo | Local Co-op | |
|---|---|---|
| Who controls what | One player controls both characters, swapping between them | Two players share one keyboard |
| On death | Level restarts from the beginning | Level restarts from the beginning |
| Win condition | Both characters reach the exit | Both characters reach the exit |
If either character dies or falls into a pit, the entire level restarts — there are no checkpoints within a level. Both survivors must reach the exit alive to advance. This makes later levels significantly punishing because a late-stage mistake costs everything earned in that attempt.
Puzzle Mechanics
Each level is built around a set of interactive elements that both characters must use together. Confirmed mechanics across the game:
| Mechanic | How it works |
|---|---|
| Pressure plates / buttons | One character stands on a plate to open a door or activate a device while the other passes through |
| Elevators | Operated by one character to transport the other to a higher or lower area |
| Locked doors | Require a key or switch activated from a different position than the door itself |
| Throwable bottles | Picked up and thrown to distract zombies or trigger distant switches |
| Kicking zombies | Clears a path for short-range movement; does not permanently remove zombies from the level |
| Boxes / crates | Pushed or stacked to reach higher platforms |
Puzzles are designed so that neither character can complete them alone — the intended solution always requires both characters to be active simultaneously or in close sequence. If a puzzle seems impossible alone, the answer almost always involves one character holding a position while the other acts.
Tips
▸ Scout the whole room before moving either character
Scroll through the level with both characters before committing either to a path. Most failed attempts come from moving one character into a zombie zone without knowing where the other needs to be. A 10-second scan saves multiple full restarts.
▸ The down key throws, not just kicks
Most players never use the bottle throw because they don’t test the down key near objects. Throwable bottles can distract zombies across the room, creating a clear path without either character needing to get close. Several puzzles are dramatically easier once this is known.
▸ Hold the plate, don’t leave it
Pressure plates deactivate the instant the character steps off. In co-op, agree before moving — the plate character stays until the other character is fully through the activated door or device, not just approaching it.
▸ In solo mode, solve one side fully before switching
When controlling both characters alone, trying to alternate every few steps creates confusion. Move one character to a stable safe position, then focus entirely on the other until their part is complete. Most solo puzzles have a “park and solve” structure.
▸ Kick zombies toward corners, not open space
Kicking a zombie into open space just repositions them — they return. Kicking toward a wall or corner gives more time before they re-enter the active path. This is especially useful near elevators where both characters need to be in position simultaneously.
The Duo Survival Series
| Game | What’s added |
|---|---|
| Duo Survival | Original — core mechanics, buttons, doors, elevators |
| Duo Survival 2 | Hidden rooms, more complex contraptions, longer levels |
| Duo Survival 3 | New puzzle types, more levels, further environmental variety |
All three games share identical controls and the same two characters. Duo Survival 2 and 3 are not harder in movement — they’re harder in puzzle complexity. If you finish the original and want more, the sequels scale in design challenge rather than platforming difficulty.
