For the square above the 'press an arrow key' text, what do the individual numbers mean when contributing to its shape and position?
cls(15) -- means clear screen with thw 15th color (white)spr(1+(t%20)/10,x,y,1,4) -- draws sprite with index = 1+(t%20)/10, with xy position, 1 means transparent color index, 4 is scale
spr id x y [colorkey [scale [flip]]]