What's the difference between pac-land and pac-land pro?
After you complete Pac-Land, you unlock a second game on the cart called "Pac-Land PRO".
The levels are different (but similar at the same time, if that makes any sense), the color pallete used for the levels is different (everything is in bright, neon colors, very 80's) and the game is extremely difficult. There are twice as many enemies, and they now move at utterly RIDICULOUS speeds. You know the pogo-stick douchebags? Imagine one hopping from one side of the screen to the other in 1.5 seconds. Pac-Man still runs at the same speed as in the regular game so your only recourse in many cases is to ride on the fast enemies through to the end.