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This was very helpful, and a select few points were very informative even OUTSIDE platformer design. Thanks again, Mark!


Damn thats pretty good.


Don't miss this excellent research on jumping

This. Is. Amazing !



A slightly updated Game Feel (

Cool, I guess

I teached me a lot ! Thanks


This is amazing and I love it, and should be necessary playing for anyone interested in learning about game feel. One note: version you show in the youtube video has a "?" help button next to the Air Control and Air Acceleration sliders, but this version does not. I had to kinda guess what they mean.


You can just jump over almost everything lol


you made your jump too high. the goal is to make it fun, not to beat the level

i know that 

really nice game😵😵😵


It's really cool and teaches you maybe how you want your platformer to be.


10/10 this is a great tool to explain character movement


Is a virus?

There's no download description




it's from gmtk




gmtk is really trusted. and no, it's not a virus.


this guy is an idiot


No it is not. Its from GMTK (Game Makers Toolkit) from Youtube. Try to search for him and he will introduce this game in his video.

Why would it be a Virus?


There's many malweres in


i mean you can just play the web version lol its right there


Really interesting and helpful for people like me who are learning to tweak platformers!

this was fun!



I love how turning speed, lookahead and jump to the max creates Canabalt.

Very interesting stuff, would definitely take a course if you were the teacher.

sooo cooool !


very nice! my one suggestion is adding captions to the presets-- i couldn't quite tell which was which apart from mario/celeste!


Mario, Sonic, Celeste, Super Meat Boy




I think I found a bug:

If you set the acceleration and deceleration to very small, the movement is very strange. Moving right and then immediately moving left makes Kit slide, but if you stop completely, and THEN turn left, Kit starts moving immediately. The latter should be how the game always responds, I think.


That isn't a bug, it is a feature. There is a setting called turn speed which controls how fast you turn

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I'm on Trug's side; This feels like a bug, not a useful feature. The turn-time should come from the interaction of acceleration, speed and deceleration, not be a separate number that you have to manually fiddle with when you change the others. (Although as a tool for learning game-development skills, maybe this is a secret lesson in itself. :)

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I think i agree with Trun : if not a bug it at least doesn't feel right, if you acceleration is supposed to be fast you should accelerate in the opposite direction at the same rate wether you're moving or not.

This is how it would be if you coded the first panel in the most straightforward way possible, so yeah it feels like a bug and i feel like the turn speed thing is not very clear about how it does what it does at least for me

That being said the essay is still fun but that feels like an oversight


very good:







100/10 game, would recommend to family and friends. hopefully, there will be a sequel!


This is a really good game, but the scroll bar is a tad bit too slow; Anyways thanks os much I know know a thing or a million about platforming :D

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This game shows the fundamentals of player movmement amazingly. Well done, love your videos. Thanks for this amazing game.

This was really cool. My only recommendation: the scroll bar (under Juice and Settings) moved really slowly when using the scroll wheel.

when will you make this for mobile?

You can play it on mobile through the browser if you have a gamepad connected to your smartphone/tablet.

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Great start. One thing that should be added (whether to this toolkit or to someone else who makes one) is a way to tie different variables together. For instance, the ability to make a slider to increase the run speed and trail length together, or landing squash and gravity together.

Here is a good article on this idea, in more general software tools.


Absolutely amazing! It really exercised my game designing chops, and by the end I almost wanted a notebook to take down tweaks and changes I would make were I designing the game. However, to serve its purpose as an educational tool, I wouldn't change one iota.

One thing I thought was really interesting is that my initial assumption was that the fastest, snappiest controls would feel the best, but I ended up going with controls that were fairly constrained to find that balance between feeling good as well as challenging.

Amazing tool. Thank you for all the hard work that went into this. Will be using this with our game design students.

wait... is possible to make a puzzle which you need right control to complete a level?


Theoretically, yes, but high-control characters would be able to complete any level a low-control character with the same physics could.  For example, there's no elegant way to make predetermined jump arcs (like "Ghouls and Goblins") necessary, even though they can greatly enhance a game.

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maybe a point system? high speed, high jump, high control, and double jump etc cost point, and you only have finite point... etc

btw im not a good puzzle maker, so im not making game lol, just talking

because even high control is already overpowered, i think everyone will add doublejump if it give you for free

and there will be some medal, cost medal need low cost, speedrun medal is fast enough, maybe.

That's a good solution!  I think as a teaching tool it would take special handling to keep it from getting lost in the weeds, but framing it as determining how much power in what ability is "necessary" could be a place to start.

this was fun


Super Mark Brown Maker when?


Hopefully after the magnet game, we don't want to overload Mark.

Thank you so much for your game! Learned how hard it is to tweak a nice movement :(


first time learning about platformers

This is cool! Thank for game!


Very cool! I just don't know how I managed to get myself stuck in a wall


What a fantastic demo! This had a lot of really great insights and I loved how interactive it is.

I would love more options to control the vertical movement of the camera. I was trying to play with a more zoomed in camera, but there wasn't an easy way for the camera to do a "Look-ahead" up and down.

I think having the *zoom* also change like lookahead would be really good - the speed of a platformer would be even more pronounced! :)


Very nice demo!. I learned a lot.

Just some opinions:

- the air acceleration, control and brake toggles (on the jumping tab) are not explained at all, not on the voice-over, nor with a (?) icon.

- the speed toggle in the Lean section in Juice tab, is not clear either. I found out it is the speed at which the character leans as it runs, but is not intuitive. Plus, I think it has a bug, because if you change direction immediately, the character also leans immediately, instead of leaning back and forward again (at such given speed).

- some preset icons are not clear. I'm guessing mushroom is mario, Strawberry is celeste, bandaid is meatboy, but the circle is sonic? it is not clear at all, and I only figured them out because you mentioned on the voice-over, but they should have labels or something.

Also, it is NOT shown anywhere if you have chosen a preset other than instantly changing the toggles. It should show an icon as an indicator of "current preset" or something.

And as an extra, I attempted to use a Dual Shock 4 controller, but at least on the browser, it didn't get detected (I use DS4windows). I could try downloading the 'game' instead of just in browser, but it should work there regardless.


the circle is a sonic ring

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