Guide to Playing The Binding of Isaac Online Co-Op with Controllers (2026 Update)
If there’s one roguelike I’ve returned to more times than I can count, it’s The Binding of Isaac. Every run feels different, every ridiculous item synergy tells its own story, and somehow the game still surprises me years after its release. For a long time, though, there was one thing I always wished for: a proper online co-op mode.
Sure, we had local co-op and later Steam Remote Play Together, but neither felt like the real thing. They worked, yet there were always little annoyances—input delay, streaming quality, controller confusion, or simply convincing everyone to use the same setup.
Thankfully, things are much better in 2026. The official online multiplayer support has matured, and playing Isaac with friends has become one of my favorite ways to spend an evening. That doesn’t mean everything is perfectly plug-and-play, especially if you’re using controllers, but once you know the right settings, it works surprisingly well.
This guide covers everything I’ve learned while playing Isaac Online with Xbox controllers, DualSense, Switch Pro Controllers, and mixed local/online sessions.
Why Online Co-Op Finally Feels Worth It
One thing I appreciate about the official multiplayer mode is that it isn’t simply a screen-sharing solution. Every player controls their own character, keeps their own build, and earns their own progression.
That alone makes online sessions feel much closer to single-player than the old “baby” co-op ever did.
Instead of feeling like someone’s assistant, everyone actually matters.
Understanding Isaac’s Three Multiplayer Modes
Before changing any settings, it’s worth knowing which multiplayer mode you’re actually trying to play.
| Mode | Best For | Main Difference |
|---|---|---|
| Classic Local Co-Op | Casual couch gaming | Second player becomes a Co-Op Baby |
| True Local Co-Op | Multiple players on one PC | Everyone controls a full character |
| Native Online Co-Op | Internet play | Separate progression and official online lobbies |
Personally, I almost never use the original baby mode anymore. Once you’ve experienced true co-op, it’s difficult to go back.
What You’ll Need
Before inviting friends, make sure you have everything installed correctly.
Requirements include:
- The Binding of Isaac: Rebirth
- Afterbirth
- Afterbirth+
- Repentance
- Repentance+ enabled through Steam
- Stable internet connection
- Steam version of the game
If the Online option doesn’t appear on the main menu, the first thing I’d check is whether Repentance+ is actually enabled in your DLC settings.
That solves the problem more often than people expect.
Controllers That Work Well
I’ve personally had success with several controller types.
Recommended controllers:
- Xbox Series Controller
- Xbox One Controller
- DualShock 4
- DualSense
- Nintendo Switch Pro Controller
- Most XInput-compatible controllers
Steam Input does an excellent job translating almost everything into a format Isaac understands.
Steam Input Is Your Best Friend
This is easily the biggest tip I can give.
Whenever someone tells me their controller isn’t working in Isaac, nine times out of ten Steam Input isn’t configured correctly.
Here’s the setup I recommend.
1. Connect Every Controller First
Always connect controllers before launching Steam.
It sounds simple, but Windows sometimes changes controller priority if devices are connected afterward.
USB tends to be slightly more reliable than Bluetooth, especially during long sessions.
2. Enable Steam Input
Inside Steam:
Steam → Settings → Controller
Enable support for whichever controller you’re using.
Examples include:
- Xbox
- PlayStation
- Nintendo Switch
Steam will automatically translate these inputs into something the game can read.
3. Enable Steam Input Specifically for Isaac
Open your Library.
Right-click The Binding of Isaac: Rebirth.
Go to:
Properties → Controller
Change the override to:
Enable Steam Input
I always do this even if global Steam Input is already enabled.
It removes a surprising number of strange controller issues.
4. Verify Everything Works
Launch Isaac.
Open the Controls menu.
Press buttons on every connected controller.
If icons appear correctly and disconnect when you unplug a controller, everything is communicating as expected.
Hosting an Online Lobby
Once controllers are working correctly, hosting is actually very simple.
Here’s the usual process:
- Launch the game.
- Select Online.
- Create a lobby.
- Invite friends through the Steam Overlay.
- Everyone joins.
- Each player selects a character.
- Start the run.
That’s really all there is to it.
Compared to the older Remote Play workaround, the official system feels dramatically cleaner.
Can You Mix Local and Online Players?
Yes.
This is one of the coolest features.
For example:
- You and a friend can play on the same PC.
- Two additional friends can join online.
- Everyone gets a full playable character.
Just remember that the local second player should join during character selection before the run begins.
When Steam Remote Play Still Makes Sense
Despite the native multiplayer, I still use Remote Play in a few situations.
Mostly when introducing someone new to the game.
Only the host needs to own Isaac, which makes it incredibly convenient.
The setup is straightforward:
- Start a new run.
- Stay inside the first room.
- Invite your friend through Steam Remote Play Together.
- Make sure they’re assigned controller access.
- Let them press Start.
- Choose their character.
It’s still one of the easiest ways to play with someone who’s curious about Isaac but doesn’t own every DLC.
Problems I’ve Actually Encountered
No multiplayer game launches without a few headaches.
After dozens of sessions, these are the issues I’ve personally seen most often.
Input Lag
This is almost always network related.
Isaac uses peer-to-peer networking.
If the host has poor upload speed, everyone feels it.
My recommendation:
- Let the person with the fastest wired internet host every session.
It genuinely makes a noticeable difference.
Random Desyncs
Mods are usually the culprit.
Even cosmetic mods occasionally create problems.
Whenever my friends and I plan a long run, we disable every Workshop mod beforehand.
It’s not exciting advice, but it’s the easiest way to avoid crashes.
Two Controllers Moving One Character
I’ve laughed about this more times than I’d like to admit.
Usually Steam assigned both devices to Player One.
The fix is simple:
- Open Steam Overlay.
- Check controller assignments.
- Verify each controller occupies a different player slot.
Problem solved.
Wrong Button Prompts
Sometimes the A button becomes B.
Sometimes Confirm becomes Cancel.
Steam Input profiles occasionally get confused.
Applying the official generic controller template usually fixes everything after restarting the game.
Tips That Made Our Sessions Better
Over time my group settled into a few habits.
They aren’t mandatory, but they make online runs smoother.
Our personal checklist:
- Everyone restarts Steam before playing.
- Mods stay disabled.
- Wired internet whenever possible.
- Controllers connected before launching Isaac.
- Host has the strongest connection.
- Nobody leaves during floor transitions.
Since adopting these habits, we’ve experienced far fewer disconnects.
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Is Online Co-Op Better Than Remote Play?
For me, absolutely.
Native online multiplayer feels more responsive, progression is properly tracked, and everyone gets equal control over their own character.
Remote Play is still useful for introducing new players, but once everyone owns the necessary content, there’s very little reason to go back.
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Final Thoughts
I’ve played The Binding of Isaac for years, and I honestly didn’t expect online multiplayer to become one of my favorite additions to the game. I thought I’d try it for a weekend and eventually return to solo runs.
Instead, my friends and I ended up sinking dozens of hours into online sessions.
Some runs are incredibly coordinated, where everyone carefully builds around shared resources. Others completely fall apart because someone picks up an item that turns the screen into absolute chaos—and somehow those are usually the funniest memories.
If you’re having trouble getting controllers recognized, don’t immediately assume something is wrong with the game itself. In my experience, nearly every issue comes down to Steam Input configuration, controller order, or mods interfering with multiplayer.
Spend five minutes checking those settings before launching a run, and you’ll save yourself half an hour of troubleshooting later.
Once everything is configured properly, Isaac’s online co-op is easily one of the most enjoyable ways to experience one of the greatest roguelikes ever made. Whether you’re chasing completion marks, experimenting with absurd item combinations, or simply trying to survive another chaotic basement run with friends, the official multiplayer experience finally delivers what fans had been asking for over the years—and it was definitely worth the wait.
