Reminder Lua lists are 1-indexed but our grid, which we create manually is 0-indexed. There's a side quest at the end of the lesson that hopefully elucidates this for kids.
I accidentally introduced a stumbling block last week, which is that I went column by column creating the rfk grid to match how cartesian coordinates are written in mathematics instead of row by row like every game author ever. I knew something felt funny but I couldn't figure out what. Now it's obvious why it felt weird so keep an eye out for x-y reversals in today's lab.