- Add a third scenario that lets you drive around the maze.

- Made the RAM in scenario 2 the same as scenario 1, so you don't start the scenario with an "out of ram" warning.
- tweaked a spot on the maze grid where you should collide
Yes, that's intentional.  I want to use the same grid as scenario 1, so that they can drive around the maze area.  I think that's what this does, right?