Some one now about Raspberry Pi 4? Can you use RP4 with makecode arcade? Can you use controller over usb?
Yes to all of the above! 
I have a Raspberry Pi 4 and it runs MakeCode Arcade just fine with a variety of browsers. It has recognized every USB gamepad that I’ve plugged into it with no issues, and they’ve worked well in MakeCode Arcade, too.
The Raspberry Pi 4 is a really nice little device. I own almost all of the previous versions, as well. Even the Raspberry Pi 2 can run MakeCode Arcade in a browser, albeit rather slowly. MakeCode Arcade runs really nicely on a Pi 4.
You can use the following website to verify that your web browser recognizes your game controllers:
Gamepad Tester - Check Controllers and Joysticks Online (gamepad-tester.com)
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Thanks you
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Hello again
You have a Arcade bootloader on Raspberry pi 4? Or are You using browser on Raspberry pi 4?
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The MakeCode Arcade bootloader (mentioned in an article by Adafruit) is designed for the Raspberry Pi Zero. It might also work on the Raspberry Pi 3 A+.
I do not own a Pi Zero or an A+. (Net yet, anyway.) I’ve used MakeCode Arcade on a variety of browsers on my Raspberry Pi devices.
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ok thanks
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Do you know if you can use non keyboard controls on retropie? I know you can use .elf files, but can you use arcade buttons and other stuff?
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Yes, but you just wire it up and configure it - it should guide you along.
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I know what mcairpos is, just asking for controller compatibility.
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Ok, sorry, @Agent_14. The game.elf files support, directly and without McAirpos, at least EV_KEY(digital) input handles with key values from 0 to 1000 in its /sd/arcade.cfg file for SCAN_CODES=/dev/input/eventX.(source)
This can be for 2 players on either 1 keyboard or 1 controller, as far as I have managed to figure out.
But many controllers have gradual/analog directional controls(EV_ABS), which I haven’t figured out how to work in this file, though some findings from the bonnet suggest it might also be supported somehow.
With McAirpos EV_ABS and EV_KEY inputs are translated/mapped to EV_KEY in /sd/arcade.cfg, and up to 2 controllers of many different types should work out of the box(see list of supported controllers known so far).
If not mapped correctly out of the box, you can edit the ~/McAirpos/McAirpos/uinput-mapper/configs/arcade1&2.py according to your the input event handler codes defined for your controller(s).
These codes can be found by testing your controller with e.g. the app evtest or .../uinput-mapper/input-read -C - D /dev/input/eventX, where X is the input event number for your controller
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Hi, To Run it on the Pi 4, you should use RetroPie. Use mcairpos to make an ELF file for RetroPie And Then Transfer The ELF To A USB Stick And Then It Should Work!