To make this work, you have to press see inside, press the flag, then press space. Then click on the 1 sprite and then play (do this for each stage). Find the key to unlock the cage to save the Princess from Bowser! Use the left/right arrows to run and the up arrow or space to jump. Make it to the green arrow to advance from screen to screen. Avoid lava and water. Enter pipes. Bump the [?] blocks from below to move blocks around and unlock puzzles. Jump on enemy's heads to defeat them.
You'll see what I changed. Thank you BoltBait and Nintendo. This game makes me think about how great these games are.