A downloadable game for Windows and macOS


Welcome to the depths of binary hell. In this place you only get two colors, and one of everything else. 


This game was created by Bryce Bucher and Ayden Machajewski for the GMTK 2019 48 hour jam with the theme "Only One". In it, you will find yourself enduring against 3 phases of a rhythmic bossfight, each set to a blood pumpin' beat. Your only means of defense is a single button. Holding it will allow you crouch and remain stationary, and letting go will give you a brief, nostalgic wind as you ascend.

Soundtrack Link



Button: Space, X (PS), A (Xbox)

-Hold: Crouch / Remain Stationary / Fast Fall (In Air)

-Release:  Jump



- One Button 

-Controller Support (for the above mentioned button)

-Accessibility Options

-Filthy Factory Pomo Aesthetic

-Very Fresh Beats



Bryce Bucher: Design, Programming, Animation, Asset Creation, Graphic Design

Ayden Machajewski: Design, Programming, FMOD Integration, Music, Sound Design, Moral Support


(Check us out on Twitter: @BryceBucher@ajmachajewski)

PlatformsWindows, macOS
Rated 3.8 out of 5 stars
(4 total ratings)
AuthorsBryce Bucher, AydenJM
TagsBoss battle, gmtk2019, Game Maker's Toolkit Jam


1B1B1B_MAC_1.0.zip 30 MB
1B1B1B_WIN_1.1.zip 25 MB

Install instructions

Unzip the file and launch "1Boss1Battle1Button.exe"


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This was so fun and extremely impressive for what the constraints were, I believe the weaknesses ended up being a strength for this game. The fast-paced nature of this game mixed with the rhythm and timing of everything going on makes for great difficulty and feels so rewarding to succeed at.


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love this aesthetic, minimal visuals yet attacks are clearly readable. had a glitch where after I won I died while I was in the menu but ive made much worse so... xD


This is extremely good! Great and unique visuals, fitting music and tight gameplay (only perhaps the "stomping" and "shooting" hands should have different xx coordinates since they can overlap and be difficult to parse). 

Great job!


this is the best game ever if you make more of this i will surely buy it

(1 edit)

There is a bug when you are jump up ,character will be seen as being in the hightlight area. if the hightlight area be attacked you were be attacked too.

(1 edit) (+1)

It's too complicated man, I don't understand how to play it. After I struggled my way through the splashscreen and main menu, I get into the game. It feels like I'm in the tutorial, but there is nothing explaining what to do or how to play the game.

For those wondering how to even start the game: first hold down space at the splashscreen, move through the menu by tapping space and click a button by holding down space.


I loved it!! The idea, the stylization, atmosphere! Great!


Game was suggested to me by a friend. It's honestly a lot of fun and really well made. The menu is a bit weird to figure out but it makes complete sense to have it like that. Perhaps the hardest part of the game is getting used to the movement system. The game is challenging, but it never felt unfair which is good. The music is pretty good to hear. Only bug I found was I died at the split last second of the final phase. I was allowed to retry but the boss was stuck in the final animation in a loop. So over all, it's an unusual but well made and fun game.