Move the grey circle and press SPACE to render lighting. Use the 'graphicsmode' slider to change graphics mode. (1 is low, 2 is high and 3 is high with bounces) Use the 'layout' slider to switch maps. Hit the B key to crash the program.
A test by @KraZKapin. It took me around an hour to make this, so it's very buggy. Feel free to remix or tamper with the program and use it in whatever you want! (Optimised 21st Dec 2017) Helpful tips: Don't play in Turbo Mode! Don't use Mode 3! If you accidentally use Mode 3, hit B! Don't change the settings or move the circle while it renders!