So you think you know how to spell? Or do you? Do you want to train your brain for vocabulary and spelling? Well, here you go.
I think this educational website, Visual Thesaurus, can train you quickly to spell very complicated words. It gets progressively harder the more you spell correctly. It gives you several times to get it right, and then you can also see the web of synonyms for the word so you can understand the meaning and put it on a visual map in your brain.
Although this can be for kids, even grownups I’ve tested it on will be challenged as it gets more difficult. Give it a shot. But a warning: it can be addictive if you’re one of those who must get a perfect score.