What is Rollback Multiplayer?

What is Rollback Multiplayer?
Opera and GameMaker are introducing a new way to do multiplayer, and it's easier than you can imagine. They still have a ways to go before it's ready for a full launch, but in today's video I'll give you a sneak peek into Rollback multiplayer, how easy it is to get up and running, and why I think it's such a big deal for game developers.
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[@memine5595]

Awesome can't wait to see much more online multiplayer tutorials in the future. Well done Opera and Yoyogames you keep going from strength to strength

[@scotthuffman3462]

This is a really cool concept but its still a little rough around the edges, its a bit jittery and could use some optimization, and playing across regions is really laggy. But if they hammer out those few issues I could see it opening up a whole new way to do networking.

[@albionpewpew]

Probably great for prototyping games

[@bromyomedits]

Let’s go more epic educational content

[@SpaceflightRocketShorts]

Might use this to revamp some of my other games...

[@Mk2kRaven]

I would love for you to do more content on this new rollback system. It is the most exciting thing Gamemaker has introduced so far, unless of course it isn't too powerful and is quite limiting. Things I would like to know: 1. What kinds of games can be made with this? 1vs1 side scrolling fighting games are famous for this type of system, but what else? 2. If you had 50, or 100 enemy instances using mp_grid to follow the player to attack him, and there were 2-4 players, would there be too much latency for a game like this to be playable? 3. Is this rollback system only for small mini games? 4. Is learning this system worth it? lol

[@LetsLearnThisTogether]

I’ll be doing a live Webinar for YoYo this coming Friday on Rollback, if you’d like to join or watch it later. I’ll certainly be doing more content on it soon. I understand it’s main limitation is it isn’t persistent, and it’s limited to 4 players right now. But it’s still very much in early access. Overall it’s not too difficult to pick up and start playing with, so I’d say give it a go at least.

[@Mk2kRaven]

@@LetsLearnThisTogether Oh sweet! I can't wait for the Webinar!! I suppose I will try out the rollback system, thanks!

[@silasfair9453]

No it is not worth it unless you are making a game that lag doesn't really matter

[@prowokator]

Nice!

[@gurpreetsingh793]

Cool feature! 😜

[@LetsLearnThisTogether]

So cool, I should probably cover it more in depth :)

[@ig2996]

Excuse me are those instance variables you used for heath?

[@ricardocarey9051]

Supposedly it's based off ggpo. Rollback is really nice for small scaled/short lived game. Famously used in fighting games, it can be used for other genres aswell example overwatch had their own.

[@LetsLearnThisTogether]

Yeah, I’m learning an awful lot since I put this out.

[@ricardocarey9051]

@@LetsLearnThisTogether yeah, it's fun imo, and gives devs an insight on the deterministic handling of things.

[@Wilson-or1rt]

How did you make that both players see different picture? When I make a sprite arrow above player 1 both players see that sprite.

[@LetsLearnThisTogether]

It’s a special rollback variable called player_local, and you can use it in the draw event like this: if (player_local) draw arrow Then that arrow will only be drawn on the active player, not the others.

[@Wilson-or1rt]

@@LetsLearnThisTogether Thank you!

[@frozentiger4896]

I keep getting “exception thrown, see JavaScript console” Whenever I turn off offline testing and try to launch the game

[@Schrogs]

I want to make an MMO that can have at least 100 people. You said this can have up to 4 people? If I want to go MMO route, how do I go down that path? Thanks for any assistance!!

[@LetsLearnThisTogether]

You’ll need to learn about networking. Look into simple multiplayer games using buffers and network calls. Then you can expand that idea into an MMO.

[@Schrogs]

@@LetsLearnThisTogether thanks so much I will do that!!!

[@Pti3rro]

When i use "rollback_get_input();" And i try to start my game. An error is made and say "rollback_get_input() is out of range with player_id=0" i don't know where from the issue because after that i try to copy tutorials and it still make the same error 😢.

[@LetsLearnThisTogether]

It’s a big in Rollback right now. The most recent version has it, it’s not your fault. Change your runtime to and older one, or wait until they release an update.

[@LetsLearnThisTogether]

bug*

[@LightOfAndromeda]

Disable online testing and run the game on GX rather than windows

[@monsterclaws2661]

Does it work for Android and iOS?

[@LetsLearnThisTogether]

I believe the goal is for any browser to be able to play the games. For debugging and making the game, you’ll need Opera GX.

[@monsterclaws2661]

@@LetsLearnThisTogether Thanks 👍

[@evildevil364]

This would be the best thing ever if you didn't need opera to play it. Most people I know have never heard of opera and I have to convince them to download it

[@gunting]

You can do it, kinda. With any browsers. But you'll need mobile phone kzbin.info/www/bejne/sKq5d5ivqdOkhZY

[@LetsLearnThisTogether]

Yeah, I don’t disagree. But this is still in Beta and just starting out. I can see it evolving over time to include more browsers and systems.

[@lukasnohejl603]

Do I need pay to export it?

[@LetsLearnThisTogether]

Read Gupreet’s comment

[@gurpreetsingh793]

@@LetsLearnThisTogether Nope, exporting to Opera is completely free

[@lukasnohejl603]

And exporting to executable is still limited?

[@lukasnohejl603]

I mean do I still need creator tier to export games to executable?

[@sethxenofightersofficialx]

Hi im seth and im making a smash bros like fighting game called xenomon I need your help with the rollback netcode its a dnd so im going to need netcode for the game since most of the stuff is alright built

[@LetsLearnThisTogether]

I can certainly help with any specific questions you’ve got. Fire away.

[@sethxenofightersofficialx]

@@LetsLearnThisTogether so it's a drag and drop so all I need a rollback netcode and I have more than one object

[@LetsLearnThisTogether]

I haven’t done rollback in drag and drop just yet, but I’m sure they’ve added that functionality by now, even if it’s just in the beta. So be sure your object is marked as managed, and then create a rollback manager object that will start your game and handle the net code. I did a webinar a few months back on rollback. It’s in GML, but still worth a watch to explain exactly how it all works and what functions you’ll need.

[@sethxenofightersofficialx]

@@LetsLearnThisTogether tell me if this is right objplayer parent obj game and Objecttheultimatexenomonmaster create y = room_height / 2; if (player_id == 0) { x = 50 } else if (player_id == 1) { x = room_width -50; } step var_input= rollback_get_input spd=20 if (_input.left) { x-= 1; } if (_input.right) { x+= 1; } if (_input.up) { x-= 1; } if (_input.down) { x+= 1; }

[@sethxenofightersofficialx]

@@LetsLearnThisTogetherHere are all of the stage buttons Stage Buttons Objectstageatlascastle Objectstagecreek Objectstagedojo Objectstageflyingwhitehouse Objectstageplanetmagical Objectstageplayplacecity Objectstageroyalcastle Objectstageteampoilceforcestage Objectstageuk Objectstagexenomonstadium

[@BromYom]

are we gonna learn this in school?

[@LetsLearnThisTogether]

It’s something we’ll touch on. It’s a cool feature to use and makes multiplayer pretty darn simple. Got ideas swirling in your head already?

[@bromyomedits]

@@LetsLearnThisTogether I don’t have a game exactly but I want to make one that has characters to talk to and stay away from the shooting style I did last year I also might wanna try somthing with this feature it’s pretty cool

[@LightOfAndromeda]

A little underwhelming how there hasn’t been any new game jams, showcases or updates regarding rollback lol

[@LetsLearnThisTogether]

It’s still in beta, but I’ve been working with it. They’ve added a fair bit to it since they launched.