Ran into an interesting problem this morning. Ever noticed that when you start a level it says "Ready" under the ghost pen? By writing and erasing that text it also erases any dots you may have placed in that region. The problem with that is that you can never eat those dots so it never counts them as being eaten and therefore the level can never be cleared For some reason this also affects the region above the ghost pen. This creates an non-editable zone (see picture).
Also apparently there are some Plus Colors and Graphics in Jr. Pac-man.
After starting the game, I pausing a second and then figured out how to get it to play.
...and here is an updated Jr.Pac-man hack that changes the Plus mode colors and fruits.