2V2.Io from Legion throws squads of two into fast-paced arenas where shooting, building, and zoning collide. Forget chunky build menus—walls, ramps, and roofs drop instantly, letting you dodge bullets and flank enemies in seconds. The adrenaline matches Undead Corridor’s corridor fights, only this time you have a teammate and a shrinking circle.
Gather wood and metal early, then build only when it matters. Z drops walls, X builds ramps, C spawns roofs, and G edits structures. Use WASD to strafe, left click to shoot, right click to aim/build, R to reload, and Space to jump. Mastering when to build vs. when to push is the secret sauce, similar to timing kicks and shots in Zombie Survival.

| Action | Key |
|---|---|
| Move | WASD / Arrow Keys |
| Shoot | Left Mouse |
| Aim / Build Mode | Right Mouse |
| Reload | R |
| Jump | Space |
| Wall / Ramp / Roof | Z / X / C |
| Edit | G |
Yes. Play directly in your browser with no downloads.
Practice basic wall/ramp placements in low-pressure matches, then layer edits ( G ) once you’re comfortable.
The game focuses on duos, but you can match with random partners if friends aren’t online.
Rounds are compact 2v2 duels, so action starts immediately instead of looting for minutes.