An RP2040 board in a Microbit form factor

This is an RP2040:bit Board Based On Raspberry Pi Microcontroller RP2040 but is the same size and pinout as the BBC Micro:bit

Features

On-board W25Q16 16M flash Memory chip
On-board 5×5 LED matrix, each LED can be programmed separately.
On-board two programmable buttons.

You get 2 headers which you can solder on, if you want the pico pinout on the back. Other wise its this Microbit type pinout

Pin	Description
0	KEYA
1	KEYB
10	GPIO that is used for the serial clock (SCK) signal of the 3-wire Serial Peripheral Interface (SPI) bus.
11	GPIO that is used for the Master Out Slave In (MOSI) signal of the SPI bus.
12	GPIO that is used for the Master In Slave Out (MISO) signal of the SPI bus.
13	CSn
17	These pins are wired to the 3V supply
18,19	Implement the clock signal (SCL) and data line (SDA) of the I2C bus communication protocol. With I2C, several devices can be connected on the same bus and send/read messages to and from the CPU.
29	ADC3

Development

You can use Micropython, Arduino or the C++ SDK. Its an RP2040, so you can use your typical development environment. I tried micropython using Thonny.

from machine import Pin
import time

led_Col=[2,3,4,5,25,7,8,9,21,22];

Pin(led_Col[0], Pin.OUT)
Pin(led_Col[1], Pin.OUT)
Pin(led_Col[2], Pin.OUT)
Pin(led_Col[3], Pin.OUT)
Pin(led_Col[4], Pin.OUT)
Pin(led_Col[5], Pin.OUT)
Pin(led_Col[6], Pin.OUT)
Pin(led_Col[7], Pin.OUT)
Pin(led_Col[8], Pin.OUT)
Pin(led_Col[9], Pin.OUT)

buttonA= Pin(0, Pin.IN, Pin.PULL_UP)
buttonB = Pin(1, Pin.IN, Pin.PULL_UP)

while 1:
    
    for i in range(len(led_Col)):
        
        i>5
        
        j=Pin(led_Col[i], Pin.OUT)
       
        Pin(led_Col[0], Pin.OUT).low()
        Pin(led_Col[1], Pin.OUT).low()
        Pin(led_Col[2], Pin.OUT).low()
        Pin(led_Col[3], Pin.OUT).low()
        Pin(led_Col[4], Pin.OUT).low()
        Pin(led_Col[5], Pin.OUT).high()
        Pin(led_Col[6], Pin.OUT).high()
        Pin(led_Col[7], Pin.OUT).high()
        Pin(led_Col[8], Pin.OUT).high()
        Pin(led_Col[9], Pin.OUT).high()
        
        time.sleep(0.2)
            
        j.high()
        Pin(led_Col[5], Pin.OUT).low()
        
        time.sleep(0.2)
        
        j.high()
        Pin(led_Col[6], Pin.OUT).low()
        
        time.sleep(0.2)
        
        j.high()
        Pin(led_Col[7], Pin.OUT).low()
        
        time.sleep(0.2)

        j.high()
        Pin(led_Col[8], Pin.OUT).low()
        
        time.sleep(0.2)

        j.high()
        Pin(led_Col[9], Pin.OUT).low()
        
        time.sleep(0.2)
            
        if (buttonA.value()==0):
            
            Pin(led_Col[0], Pin.OUT).high()
            Pin(led_Col[1], Pin.OUT).high()
            Pin(led_Col[2], Pin.OUT).high()
            Pin(led_Col[3], Pin.OUT).high()
            Pin(led_Col[4], Pin.OUT).high()
            Pin(led_Col[5], Pin.OUT).low()
            Pin(led_Col[6], Pin.OUT).high()
            Pin(led_Col[7], Pin.OUT).high()
            Pin(led_Col[8], Pin.OUT).high()
            Pin(led_Col[9], Pin.OUT).high() 
        
            time.sleep(0.5)
        
        elif (buttonB.value()==0):
            Pin(led_Col[0], Pin.OUT).low()
            Pin(led_Col[1], Pin.OUT).low()
            Pin(led_Col[2], Pin.OUT).low()
            Pin(led_Col[3], Pin.OUT).low()
            Pin(led_Col[4], Pin.OUT).high()
            Pin(led_Col[5], Pin.OUT).low()
            Pin(led_Col[6], Pin.OUT).low()
            Pin(led_Col[7], Pin.OUT).low()
            Pin(led_Col[8], Pin.OUT).low()
            Pin(led_Col[9], Pin.OUT).low()        
        

            time.sleep(0.5)
       

The LEDs lights up one by one.
When button A is pressed, the first horizontal row of LEDs on the top will light up.
When button B is pressed, the row near button B lights

Pricing

You can get this board for under £7 from Aliexpress

Raspberry Pi Pico RP2040 bit board

Raspberry Pi Pico RP2040 bit kit