The next practice tool is a set of grids with an answer pool at the bottom. Drag and drop the appropriate hiragana and katakana (which are color-coded) to the right spots, next to their romaji.
If you put it in the correct place, it stays where you dropped it. If it's wrong, the spot flashes red and the kana goes back to the bottom.
There's also a timer at the top which starts automatically when you open the page. Next to that, any errors you make are counted. See how accurate you are with your mouse while you practice your kana and memorize the aiueo columns.