the first you want to do is to make sure that the Flip Knight timer cart is in your carts folder, which you can do by opening up the timer cart in Pico-8 then in the command line type in "save Flipknight(timer).p8"(also I want to mention that the FlipKnight(timer) part can be whatever you want the filename to be, personally I would recommend that name). then open up the command prompt, and enter in this(including the quotes) "C:\Program Files\Pico-8\pico8.exe", and that should open up pico 8 and after that, all you want to do is type into the command line "load Flipknight(timer).p8"(and again put in whatever you named the file if you didn't name it Flipknight(timer)). and now you can just play the game and command prompt should tell you what your time is.