I found The Witness perfectly balanced. None of the puzzles were insurmountable but some took plenty of headscratching. The way that if you get stuck you can go

I found The Witness perfectly balanced. None of the puzzles were insurmountable but some took plenty of headscratching. The way that if you get stuck you can go and try a different area of the island made it - I might have lost interest if I'd been stuck with no room for manoeuvre.