Twinkle Twenty -ZX Spectrum-

 by DENIM MSX

TWINKLE TWENTY 
is a mini-game to measure concentration and attention. Every night before going to sleep, Manolito must see twenty stars from his window and locate in which quadrant of the window they are (1-2-3 or 4).
Pay attention all the time!! Don´t blink! Because, the waiting time until the star comes out is unpredictable. 

Source: https://bunsen.itch.io/twinkle-twenty-by-denim-msx