Tower defense is great solo, but it gets a different kind of tense when a teammate’s lane is the one about to break. The best multiplayer tower defense games turn a quiet puzzle into a group scramble, whether you are defending the same map together or racing to crack each other’s defense. These five cover the full range, from relaxed co-op you can play with anyone to competitive matches that will expose exactly who skipped the tutorial. If the genre itself is new to you, our primer on what tower defense actually is covers the basics first.

What the Best Multiplayer Tower Defense Games Get Right

There are two flavors here. Co-op tower defense games put your whole squad on the same side, splitting a map or a set of roles, and they live or die on coordination. Versus games pit you against other players, where your defense and your attack share the same wallet. The picks below are ranked from the friendliest coop tower defense up to the most punishing competitive play, so pick your entry point based on how much your group enjoys being yelled at.

1. Bloons TD 6

The most accessible co-op on the list. Bloons TD 6 lets up to four players defend any map together, each taking a section of the track and a slice of the shared cash. It is forgiving enough that a mixed-skill group still has fun, and deep enough that a coordinated team can split roles, with one player farming, one handling cleanup, and one anchoring damage.

The catch is the shared economy. An over-spender can starve the team right before a tough rush, so some lane discipline helps. It headlines our ranking of the best tower defense games ever made, and the co-op mode is a big reason why.

2. Sanctum 2

Sanctum 2 is the rare game where the shooting and the building share the same job. You spend a build phase laying out a maze of towers and walls, then drop into first-person and personally blast the aliens funneling through it, with up to four players in co-op. Its four character classes each bring different weapons and strengths, so a squad naturally divides into maze architects and frontline shooters.

Harder difficulties punish a sloppy maze fast, and a team that does not agree on a layout will watch the cores fall together. You can grab it on Steam, and it remains the cleanest fusion of FPS and tower defense out there.

3. Dungeon Defenders II

Dungeon Defenders II is the action-RPG take on the formula, and it is free to play in four-player co-op. Each player picks a hero whose defenses cover a different job, so one builds walls, another lays traps, and a third focuses on the towers that handle air. Then everyone grabs a weapon and fights on the field between waves.

The role split is the whole appeal, and a team that divides lanes and defense types clears content a solo player cannot. The official site tracks the current season. Our roundup of the best free tower defense games has more no-cost picks like it.

4. Legion TD 2

This is the deep end. Legion TD 2 descends from the legendary Warcraft III mod, and it strips away the action to focus purely on unit placement, wave reads, and economy timing. You party as two to eight players in 2v2 and 4v4 matches, sending mercenaries at the enemy while your own lane holds, with over 100 fighters and millions of build combinations.

It is also the game that punishes uncoordinated teams hardest. One player who misreads a wave or over-extends their economy can lose the match for everyone, which is exactly why its ranked scene has stayed fierce since 2017. The official site runs monthly cash tournaments, and the monetization is purely cosmetic.

5. Bloons TD Battles 2

For pure head-to-head, Bloons TD Battles 2 is the standout. It is a free one-on-one duel where you build your defense while sending bloons to overwhelm your opponent, climbing nine arenas toward the Hall of Masters. There are 22 monkey towers and a deep upgrade tree, so the strategy space is enormous even though it is just you versus one other person.

It is more duel than squad game, but it is the most direct competition on this list, and the matchmaking grind is real. Many of these games are at their best on a desktop, which is why most of them appear in our ranking of the best tower defense games on PC.

Which One Should Your Group Play?

For a casual night with mixed skill levels, Bloons TD 6 co-op is the safe call. Sanctum 2 is the pick if your group wants to shoot as much as build, and Dungeon Defenders II is the free, role-driven option for a committed four. Step up to Legion TD 2 when your squad wants real competition and can handle a loss being someone’s fault, and drop into Bloons TD Battles 2 for a quick one-on-one. For more, browse the rest of our tower defense guides, or head to StrategyGame for your next defense to share.