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So I think 8x8 sprites are quite small for TIC-80's "big" screen
You can blit multiple sprites as a map, but it's not comfortable (you have to draw the sprite, then build the same as map) and also lose some of the spr function's features (scale, flip and rotate).
So this function is handles a group of sprites together the same way as a single sprite
The parameters are the same as the spr function's, except you can specify w and h (width and height) the way you use cellw and cellh with the map function