Rimworld is a tile-based videogame. There is a constructible called a sun lamp, which provides light for indoor farming:
As you can see, the area covered by the lamp is 11 * 11, minus 1 for the lamp itself, minus 4 corners * 5 tiles not covered in each corner. That's 11*11-1-4*5 = 121-1-20 = 100 tiles total.
There is another constructible you can see in this image, the hydroponics basin, which provides superior soil. It covers a 4*1 area.
The current optimized setup is also shown in this image: 24 basins cover 96 tiles of a sun lamp's area. The question is: is there a way to fit 25 in, covering all the tiles?