If you want to lunch the KiCad project, you might need to import the Raspberry Pi Pico KiCad symbol:
Otherwise, this schematic shows the connections:
You might want to test your circuit on a breadboard:
Tip
At this point, it is a good idea to skip the soldering part and install CircuitPython and the picocade code to test if everything works with PICO-8. Once you pass this test, you can start the soldering.
The final board is just a replica of the circuit in the breadboard. Note this picture is still missing the connections to the arcade switches:
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