Sed should be Sad: I assume you mean sad and happy.
The final puzzle you match the word refute with itself. It's also very difficult because some of the words are synonyms and so it involves guessing what you matched, rather than knowing what the English words mean.
It's a cute concept, but I would not replay the game, because it always follows the same pattern. The words or their positions would need to change for someone to want to play the game again.