Countries for third group was marked as incorrect. Countries of the world was the correct answer...where were my countries from then?

Ah, going by Geraint's comment, you wanted "country", not "countries". I did put "country" but I would have knocked a point off the quality score if I'd realised that.

Also, "wall" was marker incorrect. Presumably it was looking for "walls". You need to be a bit more flexible.

Makes no sense to want "country" not "countries", but "walls" not "wall". Otherwise a good grid.

didnt accept any group descriptions even though they were right....

Pathetic. All my answers were right but showed up as incorrect.

Don't worry about getting the links right, guys. The score is not recorded anywhere and YOU know whether you were right or not.
Little Jim: in the links, if you had put "countr" it would have accepted country and countries.
Good grid, although the Chile group connection was a bit weak.

Sometimes it’s the easy ones which have you stumped... would World Cup qualifiers work for red group also? Thanks for grid!

you've posted the same grid three times